Protecting more views from (bad) MotionEvents

When handling MotionEvents, the method findPointerIndex can return -1
if the current pointer id can't be translated to a pointer index.
Some views are not handling this, which will lead to an out-of-
index crash. In 2585e9bd there were checks added, this change adds
some more.

Change-Id: I93ce2420afd83a06b689a1ed35ead7d170cd68f1