TaxonomyEditorPlugin has NullPointerException if category.sort.options=name

In an undocumented feature, it is possible to sort categories by name using 'category.sort.options=name' 
at 
/hippo:namespaces/hippotaxonomy/classifiable/editor:templates/default/root  (for the TaxonomyBrowser)
and at
/hippo:namespaces/hippotaxonomy/taxonomy/editor:templates/default/root  (for the TaxonomyEditorPlugin)

The latter is broken since 13.2 (due to HIPPLUG-1583): it produces a NullPointerException and a long stack trace.

In code, in the constructor of TaxonomyEditorPlugin, the currentLocaleSelection member is set after it is passed to getCategoryComparator() method:

150   categoryComparator = getCategoryComparator(config, currentLocaleSelection);
151   treeNodeIconProvider = FolderTreePlugin.newTreeNodeIconProvider(context, config);
152
153   currentLocaleSelection = getLocale();