Videosendstream can be created before capturer starts, so initially the frame resolution may be zero. Add a check to prevent test failure and undesired behavior.
Bug: webrtc:7737
Change-Id: I8f4402e866f45ea1eb112437f866170691a111f6
Reviewed-on: https://webrtc-review.googlesource.com/95102
Commit-Queue: Ying Wang <yinwa@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24404}