check for $__ before using its adhocPaths

Author: kusold

lib/document.js

@@ -732,7 +732,8 @@ Document.prototype.get = function (path, type) {
  */
 
 Document.prototype.$__path = function (path) {
-  var adhocs = this.$__.adhocPaths
+  var base = this.$__
+    , adhocs = (base) ? base.adhocPaths : undefined
     , adhocType = adhocs && adhocs[path];
 
   if (adhocType) {