Merge "Disable boot jars package check if no boot jars have been configured"...

Merge "Disable boot jars package check if no boot jars have been configured" am: 99fc06f8 am: 5a5f422c

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1742164

Change-Id: I807bfedb98b3bf728bc68389b1aaf544b3fe69f4