tree fabcd5033d359fb489c0567b6f77e08644a7d614
parent 1cfbdcec9b940a5f3450f0b53a4d58ea223ce714
author Tony Wickham <twickham@google.com> 1569009254 -0700
committer Tony Wickham <twickham@google.com> 1569038981 +0000

Don't crash when swiping up if there are no TaskViews

This can happen in LockTask mode, after enabling Overview. In that case,
you are locked to the current task, but are allowed to go to overview
but no tasks are shown there.

Bug: 139917483
Change-Id: I2180cc5e72c343977ea53cc02907ed8dac0f8bc6
(cherry picked from commit 60bf8c117b2388a8f243f20e673c29656548be4a)