Fix batch form javascript

git-svn-id: https://humgenprojects.lumc.nl/svn/mutalyzer/trunk@606 eb6bd6ab-9ccd-42b9-aceb-e2899b4a52f1

mutalyzer/templates/batch.html

@@ -108,7 +108,8 @@
     <script language="javascript">
         oldload = window.onload
         initpage = function() {
-            oldload();
+            if (oldload)
+              oldload();
             onloadBatch();
         }
     </script>