[BUGFIX] Prevent calling isFileValid with null

Resolves: #93997
Releases: master
Change-Id: Idf0591125371cc25f53b8c9cc178a5c595c7be2d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68887
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

phpstan.neon

@@ -246,10 +246,6 @@ parameters:
       message: "#^Parameter \\#1 \\$manifest of method TYPO3\\\\CMS\\\\Core\\\\Core\\\\ClassLoadingInformationGenerator\\:\\:getAutoloadSectionFromManifest\\(\\) expects stdClass, object given\\.$#"
       count: 2
       path: typo3/sysext/core/Classes/Core/ClassLoadingInformationGenerator.php
-    -
-      message: "#^Parameter \\#1 \\$file of method TYPO3\\\\CMS\\\\Core\\\\Controller\\\\FileDumpController\\:\\:isFileValid\\(\\) expects TYPO3\\\\CMS\\\\Core\\\\Resource\\\\FileInterface, TYPO3\\\\CMS\\\\Core\\\\Resource\\\\File\\|null given\\.$#"
-      count: 1
-      path: typo3/sysext/core/Classes/Controller/FileDumpController.php
     -
       message: "#^Parameter \\#2 \\$callback of function array_walk expects callable\\(\\)\\: mixed, array\\(\\$this\\(TYPO3\\\\CMS\\\\Core\\\\Cache\\\\Backend\\\\AbstractBackend\\), 'flushByTag'\\) given\\.$#"
       count: 1

typo3/sysext/core/Classes/Controller/FileDumpController.php

@@ -182,8 +182,7 @@ protected function createFileObjectByParameters(array $parameters)
                 $file = $this->resourceFactory->getFileObject($parameters['f']);
                 if ($file->isDeleted() || $file->isMissing()) {
                     $file = null;
-                }
-                if (!$this->isFileValid($file)) {
+                } elseif (!$this->isFileValid($file)) {
                     $file = null;
                 }
             } catch (\Exception $e) {