#161979 noticed by bboyjay, patch by myself: kill noticedisplayed when no comments were selected for the mass operation

modules/comment/comment.module

@@ -1167,7 +1167,7 @@ function comment_operations($action = NULL) {
 function comment_admin($type = 'new') {
   $edit = $_POST;
 
-  if (isset($edit['operation']) && ($edit['operation'] == 'delete') && $edit['comments']) {
+  if (isset($edit['operation']) && ($edit['operation'] == 'delete') && isset($edit['comments']) && $edit['comments']) {
     return drupal_get_form('comment_multiple_delete_confirm');
   }
   else {