Merge pull request #92 from towards-a-new-leftypol/fixes

Potential fix for an error message that mods get when banning

inc/mod/pages.php

@@ -1846,7 +1846,7 @@ function mod_ban_post($board, $delete, $post, $token = false) {
         'token' => $security_token
     );
 
-    if($_GET['thread']) {
+    if(isset($_GET['thread']) && $_GET['thread']) {
         $args['thread'] = $_GET['thread'];
     }