Crosperf: Mark benchmark run as failed if it contains no results.

Sometimes telemetry tests do not fail but results are empty.
In that case, mark the run as failed explicitly.

BUG=chromium:729634
TEST=Tested manually on failing lummpy nightly tests. The generated report shows
tests as failed as expected.

Change-Id: Ia52af887e81ed630d7578f9abe93f9656c70512b
Reviewed-on: https://chromium-review.googlesource.com/526392
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Trybot-Ready: Manoj Gupta <manojgupta@chromium.org>
1 file changed