Handle NSException from removeItemAtIndex.

gtk/gtkapplication-quartz-menu.c

@@ -393,9 +393,16 @@ menu_item_removed (gint     position,
                    gpointer user_data)
 {
   GNSMenu *menu = user_data;
-
+  @try
+  {
     [menu removeItemAtIndex:position];
   }
+  @catch(NSException *err)
+    {
+      g_critical("GNSMenu removeItemAtIndex: %d raised exception %s", position,
+                 [[err reason] UTF8String]);
+    }
+}
 
 @implementation GNSMenu