protected function skipEmptyUpdate(FormBuilderInterface $formBuilder, $fieldDefinitionIdentifier)
    {
        $options = array(
            'mapped' => false,
            'data' => 'yes',
        );

        $formBuilder->add(
            "ezforms_skip_empty_update_{$fieldDefinitionIdentifier}",
            HiddenType::class,
            $options
        );
    }