Extension:NoViewOnBlock

Description
This extension prevents blocked users from viewing the wiki

Installation
Copy this into extensions/NoBlockedUserView.php:

extensions/NoBlockedUserView.php
isBlocked && $action = 'read') { $result = false; return false; }   else { $result=null; return true; } } ?>

Now add this to your LocalSettings.php file:

LocalSettings.php
require_once("$IP/extensions/NoBlockedUserView.php");

Status
This module works very well, however there are some limitations and a minor bug:
 * Blocked users will be turned away with "You need to be in the group * to view this wiki."
 * All blocked users will be turned away, keep this in mind.