Describe the bug

PHP Warning: Trying to access array offset on value of type null in /var/www/html/public/typo3conf/ext/solr/Classes/Util.php line 119

To Reproduce
Steps to reproduce the behavior:
Delete a record which is not referenced to an existing col_pos. Happen when you switch backend layouts.

Expected behavior
Check value of BackendUtility::getRecord before accessing it as array

Used versions (please complete the following information):

• TYPO3 Version: 11.5.19
• Browser: Chrome
• EXT:solr Version: 11.5.0
• Used Apache Solr Version: 8.11.1
• PHP Version: 8.1.11
• MySQL Version: 10.2.44-MariaDB-1:10.2.44+maria~bionic-log - mariadb.org binary distribution