Fix timing problem with languge menu when using combined configuration files

unpacked/MathJax.js

@@ -1410,7 +1410,7 @@ MathJax.Localization = {
       data = data.domains[domain];
     }
     MathJax.Hub.Insert(data,definition);
-    if (isNew && MathJax.Menu) {MathJax.Menu.CreateLocaleMenu()}
+    if (isNew && MathJax.Menu.menu) {MathJax.Menu.CreateLocaleMenu()}
   },
   
   //

unpacked/extensions/MathMenu.js

@@ -1071,6 +1071,7 @@
   //  Creates the locale menu from the list of locales in MathJax.Localization.strings
   //
   MENU.CreateLocaleMenu = function () {
+    if (!MENU.menu) return;
     var menu = MENU.menu.Find("Language").menu, items = menu.items;
     //
     //  Get the names of the languages and sort them