message: Fix rogue (partial) call bar
  Call state is now null if there is no call, so check for that too
diff: @@ -123,7 +123,9 @@ export default class RoomStatusBar extends React.Component {
  };
  _showCallBar() {
  - return this.props.callState !== CallState.Ended && this.props.callState !== CallState.Ringing;
  + return (this.props.callState &&
  + (this.props.callState !== CallState.Ended && this.props.callState !== CallState.Ringing)
  + );
  }
  _onResendAllClick = () => {
  