Bug 114512 [working sets] Package explorer should only allow working sets that have an updater installed
I20051101-0010 The package explorer started to support working sets different than the Java working set. However, the package explorer must ensure that an working set updater is installed otherwise it will end up showing stale/bogus content.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/WorkingSetConfigurationDialog.java
private static class WorkingSetLabelProvider extends LabelProvider {
		private Map fIcons;
		public WorkingSetLabelProvider() {
			fIcons= new Hashtable();
		}
		public void dispose() {
			Iterator iterator= fIcons.values().iterator();
			while (iterator.hasNext()) {
				Image icon= (Image)iterator.next();
				icon.dispose();
			}
			super.dispose();
		}
		public Image getImage(Object object) {
			Assert.isTrue(object instanceof IWorkingSet);
			IWorkingSet workingSet= (IWorkingSet)object;
			ImageDescriptor imageDescriptor= workingSet.getImage();
			if (imageDescriptor == null)