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Describe the bug
A pull request in GitHub will create links in the Connections tab of the Rally story/defect. If the check is re-triggered, another connection will be created each time. This will happen when changing the title or body of a pull request, or when new commits are pushed to a PR.

To Reproduce
Steps to reproduce the behavior:

1. Open a pull request with a user story (or valid artifact)
2. Let the check complete
3. Change the title or body, or make a new commit
4. See another connection added in Rally

Expected behavior
A connection is made only when the current PR isn't already linked

Screenshots

Additional context
Add any other context about the problem here.