Don't panic if no certificates found am: b7550aa0 am: 3495c736 am:...

Don't panic if no certificates found am: b7550aa0 am: 3495c736 am: e3082c62 am: 68f2f321 am: fc09063c

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2596605



Change-Id: I09286c9ba04ee6b76217fe88c73b23239c3ad4af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>