Merge "Fully null check mRecentsAnimationController" into sc-dev am: d61f224570 am: 4eacef2e1b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15147296

Change-Id: Ia7c8b6feadc756c24b7f877111e60da565097920