fix: Skip date testing if not configured

[zkoppert]

Pull Request

Proposed Changes

This change modifies the condition for skipping a repository based on its creation date. Now, the code first checks if a created_after_date exists before comparing it to the repository's creation date.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run make lint and fix any issues that you have introduced
• run make test and ensure you have test coverage for the lines you are introducing

Reviewer

• Label as either bug, documentation, enhancement, infrastructure, maintenance or breaking