Fix ConnectionServiceFocusManager NPE am: 021a0ee8ff am: 16e65883f0 am: df26b7f841

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

Change-Id: Ief802f464bf45e18e1bce2c28c7f2cb452dd3547
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>