React 0.14.7: `<option value="">empty</option>` emits empty string on change
http://jsbin.com/pisita/10/edit?html,js,console,output
React 15.0.0-rc.1`<option value="">empty</option>` emits string with value "empty" on change
http://jsbin.com/bemaze/12/edit?html,js,console,output
This is because React 15.0.0-rc.1 cuts off `value=""` from option tag

var props = this._currentElement.props;
  var returnValue = LinkedValueUtils.executeOnChange(props, event);
  
  
  
  ReactUpdates.asap(forceUpdateIfMounted, this);
  var name = props.name;
  if (props.type === 'radio' && name != null) {
    var rootNode = ReactDOMComponentTree.getNodeFromInstance(this);
    var queryRoot = rootNode;
    while (queryRoot.parentNode) {
      queryRoot = queryRoot.parentNode;
    }