message: When no member, use `null` `roomId`
diff: @@ -1234,7 +1234,7 @@ module.exports = React.createClass({
  });
  } else {
  // This user is not a member of this room, show the user view
  - member = new Matrix.RoomMember(roomId, userId);
  + member = new Matrix.RoomMember(null, userId);
  this._setPage(PageTypes.UserView);
  }
  dis.dispatch({
  