"ViE GetSentRTCPStatistics fails on a sending channel if it don't receive rtp video packets. BUG=222 TEST= tested in loopback. No new test added yet. Review URL: http://webrtc-codereview.appspot.com/343003 git-svn-id: http://webrtc.googlecode.com/svn/trunk@1387 4adac7df-926f-26a2-2b94-8c16560cd09d