Unbind for a nil superview until I come up with a better idea.  I think this can cause problems if the view is re-parented.
Unbind for a nil superview until I come up with a better idea.  I think this can cause problems if the view is re-parented.

This fixes a crash (assertion in -dealloc) when using bindings.  It was not exposed previously since I was unbinding manually before a window closed.
bitemyapp/fileview,bitemyapp/fileview,amaxwell/fileview