Make FacetNavigationProvider more robust against misconfiguration (was: CMS show blank page after login because of runtime error)

08.05.2015 13:25:26 ERROR [org.apache.wicket.RequestCycle.logRuntimeException():1558] Error attaching this container for rendering: [MarkupContainer [Component id = body]]
org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [MarkupContainer [Component id = body]]
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1789)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:532)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.plugins.cms.browse.DocumentCollectionView.onBeforeRender(DocumentCollectionView.java:146)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:532)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:532)
at org.hippoecm.frontend.plugins.cms.browse.BrowserPerspective.onBeforeRender(BrowserPerspective.java:201)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:151)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.plugins.standards.tabs.TabbedPanel.onBeforeRender(TabbedPanel.java:359)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.hippoecm.frontend.service.render.AbstractRenderService.onBeforeRender(AbstractRenderService.java:532)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1777)
at org.apache.wicket.Component.onBeforeRender(Component.java:4001)
at org.apache.wicket.Page.onBeforeRender(Page.java:1555)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.wicket.Component.prepareForRender(Component.java:2297)
at org.apache.wicket.Page.prepareForRender(Page.java:1545)
at org.apache.wicket.Component.prepareForRender(Component.java:2329)
at org.apache.wicket.Page.renderPage(Page.java:912)
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:261)
at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
at org.hippoecm.frontend.PluginRequestCycleProcessor.respond(PluginRequestCycleProcessor.java:85)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1287)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1358)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1465)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: Node name can not be empty.
at org.hippoecm.repository.api.NodeNameCodec.encode(NodeNameCodec.java:133)
at org.hippoecm.repository.api.NodeNameCodec.encode(NodeNameCodec.java:101)
at org.hippoecm.repository.jackrabbit.facetnavigation.FacetNavigationProvider.doPopulate(FacetNavigationProvider.java:152)
at org.hippoecm.repository.jackrabbit.facetnavigation.FacetNavigationProvider.populate(FacetNavigationProvider.java:90)
at org.hippoecm.repository.jackrabbit.HippoLocalItemStateManager.getItemState(HippoLocalItemStateManager.java:388)
at org.apache.jackrabbit.core.state.SessionItemStateManager.getItemState(SessionItemStateManager.java:161)
at org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:382)
at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:669)
at org.apache.jackrabbit.core.ItemManager.getNode(ItemManager.java:647)
at org.apache.jackrabbit.core.LazyItemIterator.prefetchNext(LazyItemIterator.java:120)
at org.apache.jackrabbit.core.LazyItemIterator.next(LazyItemIterator.java:257)
at org.hippoecm.repository.decorating.RangeIteratorDecorator.next(RangeIteratorDecorator.java:112)
at org.hippoecm.repository.decorating.NodeIteratorDecorator.nextNode(NodeIteratorDecorator.java:54)
at org.hippoecm.frontend.observation.NodeState.<init>(NodeState.java:154)
at org.hippoecm.frontend.observation.JcrObservationManager.addEventListener(JcrObservationManager.java:103)
at org.hippoecm.frontend.model.event.JcrEventListener.start(JcrEventListener.java:73)
at org.hippoecm.frontend.model.JcrNodeModel.startObservation(JcrNodeModel.java:142)
at org.hippoecm.frontend.model.event.ObservableRegistry.addObserver(ObservableRegistry.java:128)
at org.hippoecm.frontend.model.event.ObservableRegistry$1.onServiceAdded(ObservableRegistry.java:111)
at org.hippoecm.frontend.model.event.ObservableRegistry$1.onServiceAdded(ObservableRegistry.java:106)
at org.hippoecm.frontend.service.ServiceTracker.addService(ServiceTracker.java:42)
at org.hippoecm.frontend.plugin.impl.PluginManager.internalRegisterService(PluginManager.java:276)
at org.hippoecm.frontend.plugin.impl.ServiceRegistration.notifyTrackers(ServiceRegistration.java:56)
at org.hippoecm.frontend.plugin.impl.PluginContext.registerService(PluginContext.java:213)
at org.hippoecm.frontend.plugins.standards.list.datatable.ListDataTable.newRowItem(ListDataTable.java:243)
at org.apache.wicket.extensions.markup.html.repeater.data.table.DataTable$1.newRowItem(DataTable.java:175)
at org.apache.wicket.extensions.markup.html.repeater.data.grid.AbstractDataGridView.newItem(AbstractDataGridView.java:129)
at org.apache.wicket.markup.repeater.RefreshingView$1.newItem(RefreshingView.java:113)
at org.apache.wicket.markup.repeater.ReuseIfModelsEqualStrategy$1.next(ReuseIfModelsEqualStrategy.java:84)
at org.apache.wicket.markup.repeater.ReuseIfModelsEqualStrategy$1.next(ReuseIfModelsEqualStrategy.java:68)
at org.apache.wicket.markup.repeater.RefreshingView.addItems(RefreshingView.java:189)
at org.apache.wicket.markup.repeater.RefreshingView.onPopulate(RefreshingView.java:98)
at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:131)
at org.apache.wicket.markup.repeater.AbstractPageableView.onBeforeRender(AbstractPageableView.java:121)
at org.apache.wicket.Component.internalBeforeRender(Component.java:1069)
at org.apache.wicket.Component.beforeRender(Component.java:1103)
at org.apache.