[BUGFIX] Fix undefined array key "pages" in FileContentParser

Fix undefined array key "pages" in FileContentParser by adding
a null coalescing operator.

Resolves: #101450
Releases: main, 12.4, 11.5
Change-Id: Idc3bba5d5ab5516689925fadec86e6fac5978e73
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80544


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

typo3/sysext/indexed_search/Classes/FileContentParser.php

@@ -477,7 +477,7 @@ class FileContentParser
                     CommandUtility::exec($cmd, $res);
                     $pdfInfo = $this->splitPdfInfo($res);
                     unset($res);
-                    if ((int)$pdfInfo['pages']) {
+                    if ((int)($pdfInfo['pages'] ?? 0)) {
                         [$low, $high] = explode('-', $cPKey);
                         // Get pdf content:
                         $tempFileName = GeneralUtility::tempnam('Typo3_indexer');