Fix ConnectionServiceFocusManager NPE am: 021a0ee8ff

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

Change-Id: I01eb9ca04c0b8134470c73a3c94f9a918c1674c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>