message: Guard against no children
diff: @@ -114,6 +114,9 @@ export default class Dropdown extends React.Component {
  }
  componentWillReceiveProps(nextProps) {
  + if (!nextProps.children || nextProps.children.length === 0) {
  + return;
  + }
  this._reindexChildren(nextProps.children);
  const firstChild = nextProps.children[0];
  this.setState({
  