Merge "[le audio] Null check when setting le audio active device" into main am: b3fdf4b1

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3387979



Change-Id: I3718b9c126d1cafb39b91b87f383f6dc295c2c20
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>