message: avoid spurious build exceptions
diff: @@ -62,11 +62,15 @@ module.exports = {
  },
  buildError: function(error) {
  + if (this._broccoliConnector) {
  this._broccoliConnector.buildFailed(error);
  + }
  },
  postBuild: function(results) {
  + if (this._broccoliConnector) {
  this._broccoliConnector.buildSucceeded(results);
  + }
  },
  treeForVendor() {
  