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

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

Change-Id: I05f734fe4ad48126ddb45a79c36c3e8c3e400ec1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>