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

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

Change-Id: I9b6ba01820192ea6e0e12aca87c06b0036b25d58