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Validate result from dblog administration filter form.

Code

modules/dblog/dblog.admin.inc, line 305

<?php
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.'));
  }
}
?>