Piwik\Plugins\WebsiteMeasurable\Settings\Urls::checkAtLeastOneUrl PHP Method

    public function checkAtLeastOneUrl($urls)
    {
        $urls = $this->cleanParameterUrls($urls);
        if (!is_array($urls) || count($urls) == 0) {
            throw new Exception(Piwik::translate('SitesManager_ExceptionNoUrl'));
        }
    }