fix: catch error that occurs when ghost usre creates an event.

[zkoppert]

Pull Request

fixes #322

Proposed Changes

This pull request changes the get_time_to_ready_for_review function in the time_to_ready_for_review.py file. The change introduces error handling to deal with potential TypeError exceptions that might occur when processing review events. If such an error occurs, a message is printed to inform the user that the issue might contain a ghost user, and None is returned.

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
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Reviewer

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