Merge "Null check on target set before rendering task open animation" into sc-dev am: 578b45f919 am: 6b4c93b0dc

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

Change-Id: Ie283811d65d57eae5b6855de99a40d192e7c824d