message: better proptypes
diff: @@ -103,8 +103,8 @@ export default React.createClass({
  propTypes: {
  room: PropTypes.object.isRequired,
  - // map from userid -> deviceid -> deviceinfo
  - devices: PropTypes.object.isRequired,
  + // map from userid -> deviceid -> deviceinfo or null if devices are not yet loaded
  + devices: PropTypes.object,
  onFinished: PropTypes.func.isRequired,
  