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GetStats() can be called before codecs are set and the underlying webrtc::VideoSendStream is created, leading to a null-pointer dereference. BUG=1788 R=pthatcher@webrtc.org Review URL: https://webrtc-codereview.appspot.com/14099004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6876 4adac7df-926f-26a2-2b94-8c16560cd09d