message: Null-guard RR logic
diff: @@ -64,7 +64,7 @@ module.exports = React.createClass({
  });
  //console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
  }
  - if (oldNode.style.visibility == 'hidden' && c.props.style.visibility == 'visible') {
  + if (oldNode && oldNode.style.visibility == 'hidden' && c.props.style.visibility == 'visible') {
  oldNode.style.visibility = c.props.style.visibility;
  }
  self.children[c.key] = old;
  