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
Change-Id: I0c7c481bb49d7d942fb4652bda7842c449ae3631