Merge "Fail check-boot-jars if boot jar contains 0 .class files" into rvc-dev am: c5fd7066 am: b96c9c35 am: 30ae5608 am: afa85599

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/11895739

Change-Id: Id5ab4dc7c53fd5b36ab2c9a6d14dcc3909ee21b9