Fix ConnectionServiceFocusManager NPE am: 021a0ee8ff am: 16e65883f0

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/2747814

Change-Id: Ie32b486d1299d4b96b5fed9bfdf8933790f98ed1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>