Fixes #7572: javascript error with left arrow keypress on a closed top tree node, with showRoot=false.  !strict
Fixes #7572: javascript error with left arrow keypress on a closed top tree node, with showRoot=false.  !strict

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@15119 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful