MxScrollView: Fixed to clip events for clipped child area in ClutterActor->pick()
MxScrollView: Fixed to clip events for clipped child area in ClutterActor->pick()

Furthermore this patch avoids warnings from calling apis on the child
actor when NULL.

pwithnall/mx,jonnylamb/mx,clutter-project/mx,pwithnall/mx,pwithnall/mx,jonnylamb/mx,jonnylamb/mx,jonnylamb/mx,clutter-project/mx,clutter-project/mx,clutter-project/mx,pwithnall/mx