Validate result from dblog administration filter form.

File

drupal-6.x/modules/dblog/dblog.admin.inc, line 304

Administrative page callbacks for the dblog module.

Code

function dblog_filter_form_validate($form, &$form_state) {
  if ($form_state['values']['op'] == t('Filter') && empty($form_state['values']['type']) && empty($form_state['values']['severity'])) {
    form_set_error('type', t('You must select something to filter by.'));
  }
}