Artem Titov 7e2f6b7d92 Fix reporting of metrics when there is no video in the test.
Before if there is no video in PC quality test video quaity analyzer
failed on RTC_CHECK becuase of empty counter. Now it will report no
metrics and print 0 in debug logging.

Bug: webrtc:10138
Change-Id: If6656a613465c522cac1d4b2e4dd455e409229ba
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133886
Reviewed-by: Artem Titarenko <artit@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27731}
2019-04-24 08:58:55 +00:00
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