Merge "Fail check-boot-jars if boot jar contains 0 .class files" into rvc-dev am: c5fd7066 am: 9f58d772 am: 734da4e9 am: b36353a4

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

Change-Id: If53cd796f820614e74e40bda2d1bdc55cb005882