Piwik\Plugins\CoreHome\Columns\UserId::isUsedInSite PHP Method

    private function isUsedInSite($idSite, $period, $date)
    {
        $result = VisitsSummaryApi::getInstance()->get($idSite, $period, $date, false, 'nb_users');
        return $this->hasDataTableUsers($result);
    }