[automerger skipped] KM VTS test fix - handled "null" value for imei. am: ba824fe2 -s ours

am skip reason: Merged-In Ia1569a30412d633eee4d4de8cd00dea077d1c23d with SHA-1 71d19b21 is already in history

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



Change-Id: I57fde27942336adc8f7236a9cb5943057b64ce66
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>