Clean up NPEs in AbsSwipeUpHandler

AbsSwipeUphandler has many potential and common NPEs. Added null checks to AbsSwipeUpHandler

Flag: NONE
Fixes: 307708536
Fixes: 307624168
Test: ran and restarted launcher
Change-Id: I0536612bfb36b4d912155158237fdb2e4fa33126
2 files changed