Fix exception when translations-file does not exist

docs/simplesamlphp-changelog.md

@@ -5,6 +5,12 @@
 This document lists the changes between versions of SimpleSAMLphp.
 See the upgrade notes for specific information about upgrading.
 
+## Version 2.0.3
+
+Released TBD
+
+* Fix exception when translation-file does not exist
+
 ## Version 2.0.2
 
 Released 2023-03-10

src/SimpleSAML/Locale/Localization.php

@@ -18,7 +18,6 @@ use Gettext\Translator;
 use Gettext\TranslatorFunctions;
 use SimpleSAML\Configuration;
 use SimpleSAML\Logger;
-use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpFoundation\File\File;
 
 class Localization
@@ -72,11 +71,6 @@ class Localization
      */
     private string $langcode;
 
-    /**
-     * @var \Symfony\Component\Filesystem\Filesystem
-     */
-    private Filesystem $fileSystem;
-
 
     /**
      * Constructor
@@ -85,7 +79,6 @@ class Localization
      */
     public function __construct(Configuration $configuration)
     {
-        $this->fileSystem = new Filesystem();
         $this->configuration = $configuration;
         /** @var string $locales */
         $locales = $this->configuration->resolvePath('locales');
@@ -250,7 +243,7 @@ class Localization
         }
 
         $file = new File($langPath . $domain . '.po', false);
-        if ($this->fileSystem->exists($file->getRealPath()) && $file->isReadable()) {
+        if ($file->getRealPath() !== false && $file->isReadable()) {
             $translations = (new PoLoader())->loadFile($file->getRealPath());
             $arrayGenerator = new ArrayGenerator();
             $this->translator->addTranslations(
@@ -268,7 +261,7 @@ class Localization
 
 
     /**
-     * Set up L18N if configured or fallback to old system
+     * Set up L18N
      */
     private function setupL10N(): void
     {