[webrtc-pc] Pull Request: Make RtpSender.track nullable

aboba has just submitted a new pull request for 
https://github.com/w3c/webrtc-pc:

== Make RtpSender.track nullable ==
Fix for Issue https://github.com/w3c/webrtc-pc/issues/567

See https://github.com/w3c/webrtc-pc/pull/577

Received on Thursday, 14 April 2016 14:27:59 UTC