Merge "BluetoothDeviceManager.java: add null check before call mBluetoothAdapter.getActiveDevices" am: a017a9751c am: f811c706f7 am: bec53c8112 am: b4eb84f9ad am: a8d3c7e271

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/1853961

Change-Id: I5d9de318ffb410d5622a482b5f7a5dd221beda9a