We purge it [here](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L88-L89) but this code doesn’t run because of the [early exit](https://github.com/facebook/react/blob/b11540ccb2321aeb7259fcf0b3a38aeeea35231d/src/isomorphic/ReactDebugTool.js#L53-L57).

Need to fix this and add a test case to make sure we don’t regress on it.

var item = tree[id];
    return item ? item.displayName : 'Unknown';
  },
  getOwnerID(id) {
    var item = tree[id];
    return item ? item.ownerID : null;
  },
  getParentID(id) {
    var item = tree[id];
    return item ? item.parentID : null;
  },
  getText(id) {
    var item = tree[id];
    return item ? item.text : null;
  },
  getUpdateCount(id) {
    var item = tree[id];
    return item ? item.updateCount : 0;
  },
  getRootIDs() {
    return rootIDs;
  },
  getRegisteredIDs() {
    return Object.keys(tree);
  },
};
module.exports = ReactComponentTreeDevtool;