Merge "Null check on target set before rendering task open animation" into sc-dev am: 578b45f919 am: d107554f08 am: 1aab577cd1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14698046

Change-Id: Ie99d4c93e33a2cd227a05fad7389ebc33170e915