[BUGFIX] Replace NullSite with PseudoSiteFinder

NullSite was failing as it was missing the `use` statement at the top.

This replaces NullSite with using the PseudoSiteFinder as it returns a
more robust "site" instance - as used in the core SiteMatcher class in
the `matchByPageId` method

Resolves: #321
Releases: 8.0.0 7.3.6

Classes/Utility/TemplaVoilaUtility.php

@@ -22,6 +22,7 @@
 use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
 use TYPO3\CMS\Core\Database\Query\Restriction\HiddenRestriction;
 use TYPO3\CMS\Core\Site\SiteFinder;
+use TYPO3\CMS\Core\Site\PseudoSiteFinder;
 
 /**
  * Class with static functions for templavoila.
@@ -206,7 +207,8 @@ public static function getUseableLanguages(int $pageId = 0)
             try {
                 $site = $siteFinder->getSiteByPageId((int)$pageId);
             } catch (\TYPO3\CMS\Core\Exception\SiteNotFoundException $e) {
-                $site = new NullSite();
+                $pseudoSiteFinder = GeneralUtility::makeInstance(PseudoSiteFinder::class);
+                $site = $pseudoSiteFinder->getSiteByPageId($pageId);
             }
             if ($backendUserAuth) {
                 $foundLanguages = $site->getAvailableLanguages($backendUserAuth);