Merge "Prevent null pointer exception by return from setBackToLauncherCallback when mBackToLauncherCallback is null" into udc-dev am: 3538deee10 am: a8fdf98f9a
Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22774999 Change-Id: I0730bb7c8841a189ded872941cd8972828b32746 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
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