Merge "KeyMint VTS: catch empty cert chains" am: 38fe3c5962 am: 675972efc4 am: 9e1c4c1486 am: aed6d2b032 am: a59ed40660

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1787827

Change-Id: I027dc8192a93909a96ebdc2932fd7d449097757a