Index: modules/comment/comment.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.module,v
retrieving revision 1.874
diff -u -p -r1.874 comment.module
--- modules/comment/comment.module	6 May 2010 05:59:31 -0000	1.874
+++ modules/comment/comment.module	9 May 2010 21:09:56 -0000
@@ -582,6 +582,9 @@ function theme_comment_block() {
   if ($items) {
     return theme('item_list', array('items' => $items));
   }
+  else {
+    return t('No comments available.');
+  }
 }
 
 /**