library/HTMLPurifier/ChildDef/Optional.php

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<?php

class HTMLPurifier_ChildDef_Optional extends HTMLPurifier_ChildDef_Required
{
    public $allow_empty = true;
    public $type = 'optional';
    public function validateChildren($tokens_of_children, $config, $context) {
        $result = parent::validateChildren($tokens_of_children, $config, $context);
        if ($result === false) {
            if (empty($tokens_of_children)) return true;
            else return array();
        }
        return $result;
    }
}

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