[BUGFIX] Fix update of existing links

This patch fix an issue while update existing links in case no selection exists.

Resolves: #80637
Releases: master
Change-Id: I89bc0603e9f0bba8f9ae1a1ef3563fc1f4432004
Reviewed-on: https://review.typo3.org/52316


Tested-by: TYPO3com <no-reply@typo3.com>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>