Merge "Fully null check mRecentsAnimationController" into sc-dev am: d61f224570 am: 597943985f am: c6192426a0

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

Change-Id: I80d82c56e3158ec9a43f6ba11c4a8e206cba42c4