Merge "KeyMint VTS: catch empty cert chains" into sc-dev am: 6e46363a34 am: ef49c282d8

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/15518062

Change-Id: Ieddb975bc3b9ecee3d49d9c50dece1e752127879