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: f07ee55a am: a90bd1e0
Change-Id: Ifda0d048a6f2d5d0a12c981c660435e8e270e005