Better handling for wrong or no extension key given

html/typo3conf/ext/ter_fe2/Classes/Controller/ExtensionController.php

@@ -180,18 +180,13 @@ class ExtensionController extends \T3o\TerFe2\Controller\AbstractController
      * Action that displays a single extension
      *
      * @param \T3o\TerFe2\Domain\Model\Extension $extension The extension to display
-     * @param string $extensionKey Extension key
-     * @return void
-     *
      * @ignorevalidation $extension
+     * @return void
      */
-    public function showAction(\T3o\TerFe2\Domain\Model\Extension $extension = null, $extensionKey = null)
+    public function showAction(\T3o\TerFe2\Domain\Model\Extension $extension = null)
     {
-        if (!empty($extensionKey)) {
-            if (!is_string($extensionKey)) {
-                throw new \Exception('No valid extension key given');
-            }
-            $extension = $this->extensionRepository->findOneByExtKey($extensionKey);
+        if ($extension === null || !$extension instanceof \T3o\TerFe2\Domain\Model\Extension) {
+            $GLOBALS['TSFE']->pageNotFoundAndExit('Extension not found!');
         }
         $owner = array();
         if ($extension instanceof \T3o\TerFe2\Domain\Model\Extension and $extension->getFrontendUser()) {