Fix the BT settings is crashing after Toggle OFF/ON

Fix java NullPointerException since some object was not created
when users didn't performed BLE advertising.

Bug: 213610155
Bug: 242230899
Tag: #stability
Test: turn on/off Bluetooth in the setting then check if Bluetooth crashes happen.
Ignore-AOSP-First: patch for wear os
Change-Id: I3adccd699e10fef79579880f0110ae8474f36955