[automerger skipped] KM VTS test fix - handled "null" value for imei. am: ba824fe285 -s ours am: bbf4d197ae -s ours

am skip reason: Merged-In Ia1569a30412d633eee4d4de8cd00dea077d1c23d with SHA-1 71d19b21c3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/23244643

Change-Id: I5c75fa254e1ea945bafb5771acdd49bb056b44da
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>