Regression: Schedule publication form throws a server error clicking OK/Cancel

1) Go to a document, for example /content/documents/hippogogreen/events/2014/11/devoxx
2) Click Publication/Schedule take offline
3) Click OK
Expected: Form is closed
Actual:

• Form is not closed, stacktrace on console
• Cancel does not close the form

[INFO] [talledLocalContainer] 19.02.2014 12:17:11 ERROR [org.apache.wicket.DefaultExceptionMapper.internalMap():123] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.core.request.handler.ComponentNotFoundException: Could not find component 'dialog:content:form:buttons:1:button' on page 'class org.hippoecm.frontend.PluginPage
[INFO] [talledLocalContainer] at org.apache.wicket.core.request.handler.PageAndComponentProvider.getComponent(PageAndComponentProvider.java:182)

[INFO] [talledLocalContainer] 19.02.2014 12:17:18 ERROR [org.apache.wicket.DefaultExceptionMapper.internalMap():123] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.markup.MarkupNotFoundException: Failed to find markup file associated. StdWorkflow: [StdWorkflow [Component id = edit]]
[INFO] [talledLocalContainer] at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.getMarkup(AssociatedMarkupSourcingStrategy.java:97)