Check for null system device am: 471169858c

Original change: https://android-review.googlesource.com/c/platform/system/gsid/+/2890662

Change-Id: I19d66fed30edcfa1699cf4b69520e34952b18686
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>