Add no-data alert for swarming_logger error rate
Add no-data alert for swarming_logger error rate

Bug: skia:
Change-Id: Id1d5d2d164289af441caf2eae41918ec028e5836
Reviewed-on: https://skia-review.googlesource.com/16168
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot