f20 - do not fail on missing metadata

not all boards will have all 4 files. Cleanly skip if missing.

BUG=None
TEST=./build_api

Change-Id: I1979d66b372b4b536cad0b539f4402d5672459ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3158561
Tested-by: Derek Beckett <dbeckett@chromium.org>
Tested-by: Sean McAllister <smcallis@google.com>
Auto-Submit: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Sean McAllister <smcallis@google.com>
Commit-Queue: Derek Beckett <dbeckett@chromium.org>
1 file changed