Telecom:fix NPE problem in the CallSManager java file. am: e99bb8100a

Original change: https://android-review.googlesource.com/c/platform/packages/services/Telecomm/+/3081386

Change-Id: I251cd88ca1a8e64731bcefe86a672c5892fd0d97
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>