Fixes local video when simulcast is disabled.

simulcast.js

     };
 
     Simulcast.prototype.getLocalVideoStream = function() {
-        return displayedLocalVideoStream;
+        return (displayedLocalVideoStream)
+            ? displayedLocalVideoStream
+            // in case we have no simulcast at all, i.e. we didn't perform the GUM
+            : connection.jingle.localVideo;
     };
 
     $(document).bind('simulcastlayerschanged', function (event, endpointSimulcastLayers) {