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   2. drupal7

Validate comment_admin_overview form submissions.

We can't execute any 'Update options' if no comments were selected.

Code

modules/comment/comment.admin.inc, line 83

<?php
function comment_admin_overview_validate($form, &$form_state) {
  $form_state['values']['comments'] = array_diff($form_state['values']['comments'], array(0));
  if (count($form_state['values']['comments']) == 0) {
    form_set_error('', t('Please select one or more comments to perform the update on.'));
  }
}
?>