try-catch for GA extra variables

src/main/webapp/WEB-INF/decorator/footer.jsp

@@ -34,7 +34,9 @@
   var _gaq = _gaq || [];
   _gaq.push(['_setAccount', '${googleAnalyticsAccount}']);
   _gaq.push(['_trackPageview']);
-  _gaq.concat(_pageGaq || []);
+  try {
+	  _gaq.concat(_pageGaq || []);
+  } catch (e) {}
 
   (function() {
     var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;