Fix for connections.toml with empty config.toml

[sfc-gh-jsikorski]

Pre-review checklist

• [x] I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• [x] I've added or updated automated unit tests to verify correctness of my new code.
• [ ] I've added or updated integration tests to verify correctness of my new code.
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• [ ] I've described my changes in the release notes.
• [x] I've described my changes in the section below.

Changes description

Fix for fix from #1791 , which was failing in case we had all connections in connections.toml and config.toml was empty.

[sfc-gh-pjob]

IMO we should use main as the target branch