[BUGFIX] Prevent undefined array key in TypolinkSoftReferenceParser

Due to an invalid page link, e.g. "t3://page?type=123",
the "pageuid" key might not be set by PageLinkHandler.

This is now properly handled in the parser.

Resolves: #100510
Releases: main, 11.5
Change-Id: I0bc35cc1e3c0f5128ea52e3645faeaa5c600faaf
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78530


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Classes/DataHandling/SoftReference/TypolinkSoftReferenceParser.php

@@ -123,7 +123,7 @@ class TypolinkSoftReferenceParser extends AbstractSoftReferenceParser
                     $finalTagParts['uid'] = $linkData['uid'];
                     break;
                 case LinkService::TYPE_PAGE:
-                    $linkData['pageuid'] = (int)$linkData['pageuid'];
+                    $linkData['pageuid'] = (int)($linkData['pageuid'] ?? 0);
                     if (isset($linkData['pagetype'])) {
                         $linkData['pagetype'] = (int)$linkData['pagetype'];
                     }