Move to other column only if no assignee left

[koppor]

Triggered by #12756

When closing a PR, we unassign the contributor and free the issue. However, if someone opens a second PR for the same issue (in the example: #12702), the action should not do this work. this PR.

This update of the action fixes it.

The change in taget-column should have no effect. With the upstream fix m7kvqbe1/github-action-move-issues#37, the current data of the issue is used (and not stale one)

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (if change is visible to the user)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[trag-bot]

@trag-bot didn't find any issues in the code! ✅✨

[github-actions]

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