[SimpleBackendSearchBundle] Fix Data setters (nullable params)

[blankse]

Changes in this pull request

See #15943
Resolves #16965

[github-actions]

Review Checklist

• Target branch (11.2 for bug fixes, others 11.x)
• Tests (if it's testable code, there should be a test for it - get help)
• Docs (every functionality needs to be documented, see here)
• Migration incl. install.sql (e.g. if the database schema changes, ...)
• Upgrade notes (deprecations, important information, migration hints, ...)
• Label
• Milestone

[lukmzig]

@blankse can you please remove the changes here?
https://github.com/pimcore/pimcore/pull/16970/files#diff-464ea7ee8142d9960b6349fb040c177d818aefdd437151c3417ff72b04fced26

we discussed this internally and we will have to investigate the issue deeper as this should generally not happen.
Then we can merge your PR, thank you!

[blankse]

@lukmzig I splitted the PR to #17020

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
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No data about Coverage
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See analysis details on SonarCloud

[lukmzig]

@blankse thank you!