[TASK] Minor optimization in bin/typo3 referenceindex:update

Skip some queries when there are no rows in a table.

Resolves: #102152
Releases: main
Change-Id: Ia156c654fb4e5d769ea6d99af6225359ac9d7f5d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81420


Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>