Markus Handell fc9079700c Fix for defect found by clusterfuzz.
Cause: VideoRtpReceiver::media_channel_ was used when it was null.
Fix: only use when provably not null.

Bug: chromium:1031013
Change-Id: I765e183186d895f39c122e26d50ac787216c44f7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161328
Commit-Queue: Markus Handell <handellm@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30017}
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