Fix NPE on STS BL am: 83236b4f91 am: d949138f01 am: 0dcb8cfa9e am: dd1b8f2a3f am: 5586fb1022 am: 5c7573c0bf

Original change: https://googleplex-android-review.googlesource.com/c/platform/platform_testing/+/22438599

Change-Id: I0683d68e55ef8662c211993b2bb8e7a4c978f8fb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>