Neos\Neos\Ui\TypoScript\Helper\SitesHelper::isActive PHP Method

    public function isActive(NodeInterface $siteNode)
    {
        if ($siteModel = $this->siteRepository->findOneByNodeName($siteNode->getName())) {
            return $siteModel->isOnline();
        }
        throw new \RuntimeException('Could not find a site for the given site node', 1473366137);
    }