Merge "Fix NPE in FallbackSwipeHandler when getRunningTask() returns null" am: 78e1964a05 am: d693b1406a

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/2361489

Change-Id: Iff1c7f7e931932e3da697b8057cbc57fc8c78aff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>