Call Redirection: unbind service when onBind returns null am: c3580d9607 am: 97392ff559 am: feb31d5445 am: 1e9d666b8a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/services/Telecomm/+/22183547

Change-Id: I801553195967efd2a26f4addce13750431cd2f9a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>