Fehlerseite bei unausgefüllten Kommentar

<?php
if ($_SERVER["REQUEST_METHOD"] != "POST") {
    header('Allow: POST');
 header("HTTP/1.1 405 Method Not Allowed");
 header("Content-type: text/plain");
    exit;
}
require( dirname(__FILE__) . '/wp-config.php' );
nocache_headers();
$comment_post_ID = (int) $_POST['comment_post_ID'];
$status = $wpdb->get_row("SELECT post_status, comment_status FROM $wpdb->posts WHERE ID = '$comment_post_ID'");
if ( empty($status->comment_status) ) {
 do_action('comment_id_not_found', $comment_post_ID);
 exit;
} elseif ( 'closed' ==  $status->comment_status ) {
 do_action('comment_closed', $comment_post_ID);
 wp_die( __('Sorry, comments are closed for this item.') );
} elseif ( 'draft' == $status->post_status ) {
 do_action('comment_on_draft', $comment_post_ID);
 exit;
}
$comment_author       = trim(strip_tags($_POST['author']));
$comment_author_email = trim($_POST['email']);
$comment_author_url   = trim($_POST['url']);
$comment_content      = trim($_POST['comment']);
// If the user is logged in
$user = wp_get_current_user();
if ( $user->ID ) {
 $comment_author       = $wpdb->escape($user->display_name);
 $comment_author_email = $wpdb->escape($user->user_email);
 $comment_author_url   = $wpdb->escape($user->user_url);
 if ( current_user_can('unfiltered_html') ) {
  if ( wp_create_nonce('unfiltered-html-comment_' . $comment_post_ID) != $_POST['_wp_unfiltered_html_comment'] ) {
   kses_remove_filters(); // start with a clean slate
   kses_init_filters(); // set up the filters
  }
 }
} else {
 if ( get_option('comment_registration') )
  wp_die( __('Sorry, you must be logged in to post a comment.') );
}
$comment_type = '';
if ( get_option('require_name_email') && !$user->ID ) {
 if ( 6 > strlen($comment_author_email) || '' == $comment_author )
  wp_die( __('Error: please fill the required fields (name, email).') );
 elseif ( !is_email($comment_author_email))
  wp_die( __('Error: please enter a valid email address.') );
}
if ( '' == $comment_content )
 wp_die( __('Error: please type a comment.') );
$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'user_ID');
$comment_id = wp_new_comment( $commentdata );
$comment = get_comment($comment_id);
if ( !$user->ID ) :
 setcookie('comment_author_' . COOKIEHASH, $comment->comment_author, time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
 setcookie('comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
 setcookie('comment_author_url_' . COOKIEHASH, clean_url($comment->comment_author_url), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN);
endif;
$location = ( empty($_POST['redirect_to']) ? get_permalink($comment_post_ID) : $_POST['redirect_to'] ) . '#comment-' . $comment_id;
$location = apply_filters('comment_post_redirect', $location, $comment);
wp_redirect($location);
?>