fix no type in postMessage can pass renderjs

renderjs.js

@@ -54,6 +54,9 @@
 // http://bit.ly/WH2TRI
 // http://bit.ly/zm0Csi
 
+// URI-templates:
+// https://code.google.com/p/uri-templates/
+
 /*jslint indent: 2, maxlen: 80, nomen: true */
 /*global window: true, $: true, undefined: true, console: true,
   document: true, require: true*/
@@ -517,8 +520,9 @@
   // => manages all interactions (listens to incoming postMessages)
   // need a switch, because only one "message" listener can be set
   priv.serviceHandler = function (event) {
-    var route = event.data.type.split("/"),
-      trackingId;
+    var type = event.data.type, route, trackingId;
+    if (type) {
+      route = event.data.type.split("/");
 
       // authenticate all message senders
       // basic "authentication" is done through the switch, which requires
@@ -552,6 +556,7 @@
         priv.returnResult(event);
         break;
       }
+    }
   };
 
   // => return the result to the function call