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

ws.php

@@ -80,7 +80,7 @@ function ws_addDefaultMethods( $arr )
   $service->addMethod('pwg.images.addComment', 'ws_images_addComment',
       array(
         'image_id' => array(),
-        'author' => array( 'default' => $user['is_the_guest']? 'guest':$user['username']),
+        'author' => array( 'default' => is_a_guest()? 'guest':$user['username']),
         'content' => array(),
         'key' => array(),
       ),