Merge "Null check on target set before rendering task open animation" into sc-dev am: 578b45f919 am: 6b4c93b0dc am: 335baa9d00

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

Change-Id: I2616421ca5f39294fded3307b2cad9960de80bc8