Bug 1465617: (Speculative fix because STR are missing) Don't crash if no video send codecs are negotiated. r=mjf

This _might_ be the fix for the nullptr crash in bug 1465617.

Differential Revision: https://phabricator.services.mozilla.com/D3337

--HG--
extra : moz-landing-system : lando

media/webrtc/signaling/src/peerconnection/TransceiverImpl.cpp

@@ -932,6 +932,12 @@ TransceiverImpl::UpdateVideoConduit()
       return rv;
     }
 
+    if (configs.values.empty()) {
+      MOZ_MTLOG(ML_INFO, mPCHandle << "[" << mMid << "]: " << __FUNCTION__ <<
+                          " No codecs were negotiated (send).");
+      return NS_OK;
+    }
+
     auto error = conduit->ConfigureSendMediaCodec(configs.values[0]);
     if (error) {
       MOZ_MTLOG(ML_ERROR, mPCHandle << "[" << mMid << "]: " << __FUNCTION__ <<