Bug 342988 - Allow plugins to rebuild menu(s), but not before CZ has initialized.

r=silver@warwickcompsoc.co.uk (James Ross)
ChatZilla Only.

extensions/irc/xul/content/static.js

@@ -3494,6 +3494,10 @@ function updateTimestampFor(view, displayRow)
 client.updateMenus =
 function c_updatemenus(menus)
 {
+    // Don't bother if the menus aren't even created yet.
+    if (!client.initialized)
+        return null;
+
     return this.menuManager.updateMenus(document, menus);
 }