[BUGFIX] Prevent possible null pointer exception in data processors

The method `getContentObject()` might return null.
This is now properly handled in the MenuProcessor
and LanguageMenuProcessor.

Resolves: #99722
Releases: main, 11.5
Change-Id: Iebaa2324c59032bd10610c2a63156168777070db
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77613


Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/frontend/Classes/DataProcessing/LanguageMenuProcessor.php

@@ -399,7 +399,7 @@ class LanguageMenuProcessor implements DataProcessorInterface
 
         // Process Configuration
         $menuContentObject = $cObj->getContentObject('HMENU');
-        $renderedMenu = $menuContentObject->render($this->menuConfig);
+        $renderedMenu = $menuContentObject?->render($this->menuConfig);
         if (!$renderedMenu) {
             return $processedData;
         }

typo3/sysext/frontend/Classes/DataProcessing/MenuProcessor.php

@@ -447,7 +447,7 @@ class MenuProcessor implements DataProcessorInterface
 
         // Process Configuration
         $menuContentObject = $this->contentObjectFactory->getContentObject('HMENU', $cObj->getRequest(), $cObj);
-        $renderedMenu = $menuContentObject->render($this->menuConfig);
+        $renderedMenu = $menuContentObject?->render($this->menuConfig);
         if (!$renderedMenu) {
             return $processedData;
         }