DrupalAPI.de

1. drupal
   1. drupal6
   2. drupal7

Code

modules/user/user.admin.inc, line 227

<?php
function user_admin_account_validate($form, &$form_state) {
  $form_state['values']['accounts'] = array_filter($form_state['values']['accounts']);
  if (count($form_state['values']['accounts']) == 0) {
    form_set_error('', t('No users selected.'));
  }
}
?>