References #7681.  Add check for when _curFocus is null (no widget has focus).
References #7681.  Add check for when _curFocus is null (no widget has focus).

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@19985 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful