Improve robustness for test runs

Change-Id: Idb3c689395388217af6808071b4cfda9a7dda74e
diff --git a/dev/js/src/loc/dereko.js b/dev/js/src/loc/dereko.js
index 87b99d4..718591e 100644
--- a/dev/js/src/loc/dereko.js
+++ b/dev/js/src/loc/dereko.js
@@ -6,9 +6,14 @@
 
 "use strict";
 
+window.KorAP = window.KorAP || {};
+
 define(function () {
   const loc = KorAP.Locale;
 
+  if (loc == undefined)
+    return;
+
   //Query example for guided tour
   if (loc.TOUR_Qexample == undefined)
     loc.TOUR_Qexample = "laufen";