Merge "Metadata tool correction: Output empty proto in case of no input" into...

Merge "Metadata tool correction: Output empty proto in case of no input" into main am: 51665cf0 am: 105ea3d7

Original change: https://android-review.googlesource.com/c/platform/build/+/2906355



Change-Id: I34bd90985f4e69b541139b16a9177c5ba096260a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>