Merge "Avoid panic when a boot jar is provided as a java_import" am:...

Merge "Avoid panic when a boot jar is provided as a java_import" am: a8baa884 am: 3641d82f am: f6729208 am: 7fc1aef3

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1450816

Change-Id: I5bff5559eecb5286de5dddf5a3739be6c48f30cc