TemplateFieldHandler::prepareParentId

public function prepareParentId()
{
	if(
		array_key_exists('PARENT_ID', $this->fields)
		&& !intval($this->fields['PARENT_ID'])
	)
	{
		$this->fields['PARENT_ID'] = false;
	}

	if (
		isset($this->fields["PARENT_ID"])
		&& intval($this->fields["PARENT_ID"]) > 0
	)
	{
		$parentTask = TaskRegistry::getInstance()->get($this->fields["PARENT_ID"]);
		if (!$parentTask)
		{
			throw new TemplateFieldValidateException(Loc::getMessage("TASKS_BAD_PARENT_ID"));
		}
	}

	return $this;
}