- check for array [lang]

- admin_forums delete routine updated
- added extension groups per forum


git-svn-id: file:///svn/phpbb/trunk@4861 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/language/en/viewtopic.php

@@ -12,7 +12,7 @@
 // -------------------------------------------------------------
 
 // DO NOT CHANGE
-if (empty($lang))
+if (empty($lang) || !is_array($lang))
 {
 	$lang = array();
 }