[BUGFIX] Fix undefined array key errors for shortcuts without link

Resolves: #95373
Releases: master
Change-Id: I961233104e0f3747aaa67f4e018852824181ee7b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71333

Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/frontend/Classes/ContentObject/Menu/AbstractMenuContentObject.php

@@ -1323,7 +1323,7 @@ abstract class AbstractMenuContentObject
             $LD['totalURL'] = $this->parent_cObj->typoLink_URL([
                 'parameter' => $shortcut['uid'],
                 'language' => $shortcut['_PAGES_OVERLAY_REQUESTEDLANGUAGE'] ?? 'current',
-                'additionalParams' => $addParams . $this->I['val']['additionalParams'] . $menuItem['_ADD_GETVARS'],
+                'additionalParams' => $addParams . $this->I['val']['additionalParams'] . ($menuItem['_ADD_GETVARS'] ?? ''),
                 'linkAccessRestrictedPages' => !empty($this->mconf['showAccessRestrictedPages']),
             ]);
         }

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

@@ -531,8 +531,8 @@ class MenuProcessor implements DataProcessorInterface
      */
     public function replacePlaceholderInRenderedMenuItem($menuItem, $conf)
     {
-        $link = $this->jsonEncode($menuItem['linkHREF']['HREF']);
-        $target = $this->jsonEncode($menuItem['linkHREF']['TARGET']);
+        $link = $this->jsonEncode($menuItem['linkHREF']['HREF'] ?? '');
+        $target = $this->jsonEncode($menuItem['linkHREF']['TARGET'] ?? '');
 
         $menuItem['parts']['title'] = str_replace(self::LINK_PLACEHOLDER, $link, $menuItem['parts']['title']);
         $menuItem['parts']['title'] = str_replace(self::TARGET_PLACEHOLDER, $target, $menuItem['parts']['title']);

typo3/sysext/indexed_search/Classes/Indexer.php

@@ -1364,7 +1364,7 @@ class Indexer
             'tstamp' => $GLOBALS['EXEC_TIME'],
             'crdate' => $GLOBALS['EXEC_TIME'],
             'gr_list' => $this->conf['gr_list'],
-            'externalUrl' => $fileParts['scheme'] ? 1 : 0,
+            'externalUrl' => ($fileParts['scheme'] ?? false) ? 1 : 0,
             'recordUid' => (int)$this->conf['recordUid'],
             'freeIndexUid' => (int)$this->conf['freeIndexUid'],
             'freeIndexSetId' => (int)$this->conf['freeIndexSetId'],