Resolved issue 0000697: with generic user a author name is necessary to comment picture.

+ Change way to determinate if user is a guest (use functions like is_admin)


git-svn-id: http://piwigo.org/svn/trunk@2029 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -423,7 +423,7 @@ function pwg_log($image_id = null, $image_type = null)
   {
     $do_log = false;
   }
-  if ($user['is_the_guest'] and !$conf['history_guest'])
+  if (is_a_guest() and !$conf['history_guest'])
   {
     $do_log = false;
   }