Simple validate handler
Overrides HandlerBase::validateOptionsForm
public function validateOptionsForm(&$form, &$form_state) {
$this
->operator_validate($form, $form_state);
$this
->value_validate($form, $form_state);
if (!empty($this->options['exposed']) && !$this
->isAGroup()) {
$this
->validateExposeForm($form, $form_state);
}
if ($this
->isAGroup()) {
$this
->build_group_validate($form, $form_state);
}
}