Minor - format code, fixing PHP warnings.

main/forum/index.php

@@ -284,7 +284,7 @@ if (is_array($forumCategories)) {
                 }
 
                 // Note: This can be speeded up if we transform the $forum_list to an array that uses the forum_category as the key.
-                if ($forum['forum_category'] == $forumCategory['cat_id']) {
+                if (isset($forum['forum_category']) && $forum['forum_category'] == $forumCategory['cat_id']) {
                     $show_forum = false;
 
                     // SHOULD WE SHOW THIS PARTICULAR FORUM

main/forum/viewthread_threaded.inc.php

@@ -68,7 +68,7 @@ foreach ($rows as $post) {
         $post_image=Display::return_icon('forumpost.gif');
     }
     $thread_structure.= $post_image;
-    if ($_GET['post']==$post['post_id'] OR ($counter==1 AND !isset($_GET['post']))) {
+    if (isset($_GET['post']) && $_GET['post']==$post['post_id'] OR ($counter==1 AND !isset($_GET['post']))) {
         $thread_structure.='<strong>'.prepare4display($post['post_title']).'</strong></div>';
         $prev_next_array[]=$post['post_id'];
     } else {