Bug 252696

Tests for ITD content assist and getting them to pass.
diff --git a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/AspectJEditor.java b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/AspectJEditor.java
index b228a2f..32ca68e 100755
--- a/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/AspectJEditor.java
+++ b/org.eclipse.ajdt.ui/src/org/eclipse/ajdt/internal/ui/editor/AspectJEditor.java
@@ -590,7 +590,7 @@
 		}
 		
 		public IStatus runInUIThread(IProgressMonitor monitor) {
-			if (elem != null) {
+			if (elem != null && aspectJEditorErrorTickUpdater != null) {
 				aspectJEditorErrorTickUpdater.updateEditorImage(elem);
 			}
 			return Status.OK_STATUS;