[BUGFIX] Avoid undefined array key in ContentObjectRenderer::stdWrap

Resolves: #99134
Releases: main, 11.5
Change-Id: I4ec448a0d06f5614cdc35e7f695c692e4080fbc3
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76699


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