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: I789d4f511b06ac399d252cabf268f11922f1b407