fix compile error
cleanup
ref #6925 Set conversation and cdmEntitySession to null for dispose
avoid widgetIsDisposed exceptions by check of control is disposed
ref #6595, 6568 Open taxon name editor in editor area
ref #6990 catch potential NPE
ref #6913 Remove org.eclipse.ui dependency from NavigationUtil
ref #6908 Migrate polytomous key list editor
fix #6990 Migrate search result view