moves the check of being disposed to the right place

refs 2553

org.fortiss.tooling.base.ui/trunk/src/org/fortiss/tooling/base/ui/editor/TreeViewerEditorBase.java

@@ -40,7 +40,7 @@ import org.fortiss.tooling.kernel.ui.extension.base.EditorBase;
  * @author hoelzl
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating GREEN Hash: 85A283C9915889DCE9314B50A06B69FF
+ * @ConQAT.Rating YELLOW Hash: B41A78E1C4B5CE289ABE9708C75C3BE2
  */
 public abstract class TreeViewerEditorBase<T extends EObject> extends EditorBase<T> {
 
@@ -52,9 +52,12 @@ public abstract class TreeViewerEditorBase<T extends EObject> extends EditorBase
 		@Override
 		public void notifyChanged(Notification notification) {
 			super.notifyChanged(notification);
-			if(notification.getEventType() != Notification.REMOVING_ADAPTER &&
-					!treeViewer.getTree().isDisposed()) {
-				Display.getDefault().asyncExec(() -> treeViewer.refresh(true));
+			if(notification.getEventType() != Notification.REMOVING_ADAPTER) {
+				Display.getDefault().asyncExec(() -> {
+					if(!treeViewer.getTree().isDisposed()) {
+						treeViewer.refresh(true);
+					}
+				});
 			}
 		}
 	};