Index: webform_validation.validators.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/webform_validation/webform_validation.validators.inc,v
retrieving revision 1.24
diff -u -r1.24 webform_validation.validators.inc
--- webform_validation.validators.inc	14 Nov 2010 16:27:46 -0000	1.24
+++ webform_validation.validators.inc	24 Nov 2010 21:17:27 -0000
@@ -178,6 +178,7 @@
       'name' => "Must be empty",
       'component_types' => array(
         'textfield',
+        'hidden',
       ),
       'description' => t('Verifies that a specified textfield remains empty - Recommended use case: used as an anti-spam measure by hiding the element with CSS'),
     ),
@@ -204,7 +205,7 @@
 function webform_validation_webform_validation_validate($validator_name, $items, $components, $rule) {
   /**
    * Preparation for select_* validation rules and the handling of key 0 for select components
-   * 
+   *
    * Only webform 3 handles a select list with key 0 properly.
    * The array_filter callback function is only loaded for webform 3 to make sure
    * it works perfectly for webform 3, and works in all cases except with key 0 for webform 2