References #7011 !strict.  Initial blank value for datetextbox should be null and not undefined.
References #7011 !strict.  Initial blank value for datetextbox should be null and not undefined.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@14404 560b804f-0ae3-0310-86f3-f6aa0a117693

redaktor/deliteful