Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 5161)
+++ wp-includes/comment-template.php	(working copy)
@@ -331,7 +331,7 @@
 	$number = get_comments_number($id);
 
 	if ( 0 == $number && 'closed' == $post->comment_status && 'closed' == $post->ping_status ) {
-		echo $none;
+		echo '<span' . ((!empty($CSSclass)) ? ' class="' . $CSSclass . '"' : '') . '>' . $none . '</span>';
 		return;
 	}