Merge "KM VTS test fix - handled "null" value for imei." into udc-dev am: 0b48df3ad7

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

Change-Id: I295efc9c654d2b95dcee0b9a7c466ac73bd347db
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>