Fix null pointer crash in AIDL radio HAL VTS am: cf892db1ef am: e065f848d0 am: bf6bd2d8ef am: e1314d36bb

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24133137

Change-Id: I3cb361bf23056b559b5a2495c5198c42a7921cab
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>