message: Fixed screen sharing when no video param is included in config
diff: @@ -125,7 +125,7 @@ const GetUserMedia = (config, callback = () => {}, error = () => {}) => {
  }
  const theId = response.streamId;
  if (config.video.mandatory !== undefined) {
  - screenConfig.video = config.video;
  + screenConfig.video = config.video || { mandatory: {} };
  screenConfig.video.mandatory.chromeMediaSource = 'desktop';
  screenConfig.video.mandatory.chromeMediaSourceId = theId;
  } else {
  