Merge pull request #452 from mrbar42/patch-1

added fallback to insertAt parentNode

Author: rauchg

lib/transports/polling-jsonp.js

@@ -132,7 +132,12 @@ JSONPPolling.prototype.doPoll = function () {
   };
 
   var insertAt = document.getElementsByTagName('script')[0];
-  insertAt.parentNode.insertBefore(script, insertAt);
+  if (insertAt) {
+    insertAt.parentNode.insertBefore(script, insertAt);
+  }
+  else {
+    (document.head || document.body).appendChild(script);
+  }
   this.script = script;
 
   var isUAgecko = 'undefined' != typeof navigator && /gecko/i.test(navigator.userAgent);