Piwik\FrontController::shouldRethrowException PHP Method

    public static function shouldRethrowException()
    {
        // If we are in no dispatch mode, eg. a script reusing Piwik libs,
        // then we should return the exception directly, rather than trigger the event "bad config file"
        // which load the HTML page of the installer with the error.
        return defined('PIWIK_ENABLE_DISPATCH') && !PIWIK_ENABLE_DISPATCH || Common::isPhpCliMode() || SettingsServer::isArchivePhpTriggered();
    }

 public function dispatch()
 {
     $module = Common::getRequestVar('module', '', 'string');
     $action = Common::getRequestVar('action', '', 'string');
     if ($module == 'CoreUpdater' || $module == 'Proxy' || $module == 'Installation' || $module == 'LanguagesManager' && $action == 'saveLanguage') {
         return;
     }
     $updater = new PiwikCoreUpdater();
     $updates = $updater->getComponentsWithNewVersion(array('core' => Version::VERSION));
     if (!empty($updates)) {
         Filesystem::deleteAllCacheOnUpdate();
     }
     if ($updater->getComponentUpdates() !== null) {
         if (FrontController::shouldRethrowException()) {
             throw new Exception("Piwik and/or some plugins have been upgraded to a new version. \n" . "--> Please run the update process first. See documentation: http://piwik.org/docs/update/ \n");
         } elseif ($module === 'API') {
             $outputFormat = strtolower(Common::getRequestVar('format', 'xml', 'string', $_GET + $_POST));
             $response = new ResponseBuilder($outputFormat);
             $e = new Exception('Database Upgrade Required. Your Piwik database is out-of-date, and must be upgraded before you can continue.');
             echo $response->getResponseException($e);
             Common::sendResponseCode(503);
             exit;
         } else {
             Piwik::redirectToModule('CoreUpdater');
         }
     }
 }