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

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

Change-Id: Ia3500e0a770bdae1b4890606bdb4c4c3c50c22f3