Fix test

Author: Adam Duncan

lib/helper.js

@@ -113,6 +113,7 @@ var generateRfc2617Response = function(username, realm, password, nonce, uri, me
 };
 
 var getDecoderOptions = function(audioOptions) {
+  if (!audioOptions) return {}
   var decoderOptions = {
       frameLength: parseInt(audioOptions[1], 10),
       compatibleVersion: parseInt(audioOptions[2], 10),