Call Redirection: unbind service when onBind returns null am: 9b753a1d0d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22262687

Change-Id: I65fa09905a355b005a6fafd2cb12fb30621292ca
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>