JBIDE-16859 JSF tag libraries registred in XML catalog in plugins packed into JARs are not available for KB
JBIDE-16972 missing bars icon in jquery mobile 1.4 property editor

List of buttons available in JQM 1.4 is updated.
JBIDE-16975 jQuery Mobile palette: add drop-down list identifier to version
JBIDE-17004 Null Pointer Exception in FormPropertySheetViewer

Check for non-null data in tab item is added, since in some OS
selectionevent goes right when item is created, before data is set.