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

} else {
      return ret;
    }
  },
  _createInitialChildren: function(transaction, props, context, lazyTree) {
    
    var innerHTML = props.dangerouslySetInnerHTML;
    if (innerHTML != null) {
      if (innerHTML.__html != null) {
        DOMLazyTree.queueHTML(lazyTree, innerHTML.__html);
      }
    } else {
      var contentToUse =
        CONTENT_TYPES[typeof props.children] ? props.children : null;
      var childrenToUse = contentToUse != null ? null : props.children;
      if (contentToUse != null) {
        
        if (__DEV__) {
          setContentChildForInstrumentation.call(this, contentToUse);
        }
        DOMLazyTree.queueText(lazyTree, contentToUse);
      } else if (childrenToUse != null) {
        var mountImages = this.mountChildren(
          childrenToUse,
          transaction,
          context
        );
        for (var i = 0; i < mountImages.length; i++) {
          DOMLazyTree.queueChild(lazyTree, mountImages[i]);
        }