Improve robustness for test runs

Change-Id: Idb3c689395388217af6808071b4cfda9a7dda74e
diff --git a/dev/js/src/loc/de.js b/dev/js/src/loc/de.js
index 41614fd..160350f 100644
--- a/dev/js/src/loc/de.js
+++ b/dev/js/src/loc/de.js
@@ -1,7 +1,13 @@
 "use strict";
 
+window.KorAP = window.KorAP || {};
+
 define(function () {
   const loc = KorAP.Locale;
+
+  if (loc == undefined)
+    return;
+  
   loc.OR = 'oder';
   loc.AND = 'und';
   // EMPTY, DELETE