Merge "Print better error when a custom image input file is missing" into main...

Merge "Print better error when a custom image input file is missing" into main am: 597e6c76 am: 37c4e7bb

Original change: https://android-review.googlesource.com/c/platform/build/+/3516572



Change-Id: I0694e74910362a67130f3b803c100e4ccb0e57ac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>