Base::getFields

protected function getFields(int $entityId, RegisterOptions $options = null): ?array
{
	$fields = null;
	if ($options && !empty($options->getEntityFields()))
	{
		$fields = $options->getEntityFields();
	}
	if (!is_array($fields))
	{
		$fields = $this->getEntityFields($entityId);
	}

	if (!is_array($fields))
	{
		return null;
	}

	return $fields;
}