Merge "Verify BluetoothDevice is not null before calling BluetoothHearingAid System APIs" into rvc-dev am: 32ec718cfa
am: f07ee55a4a
am: 290f90bfaa
am: 29d2b7fe2b
Change-Id: I5e1e77a69ebb27d92b741bd48eaabd7e1438732d
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