Merge "Verify BluetoothDevice is not null before calling BluetoothHearingAid...
Merge "Verify BluetoothDevice is not null before calling BluetoothHearingAid System APIs" into rvc-dev am: 32ec718c am: 3376c485
Change-Id: I24f6c123bb6c4b2731de1db8c49b653bbf87458d