Repository: huggingface/transformers
Pull request: Fix missing definition of diff_file_url in notification service

# What does this PR do?

Yesterday's PR to track the performed tests in CI (https://github.com/huggingface/transformers/pull/39198) resulted in a small error, this PR fixes that:
https://github.com/huggingface/transformers/actions/runs/16309221900/job/46061828202


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
members/contributors who may be interested in your PR.

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Changed files:
filename: utils/notification_service.py
patch: @@ -1497,8 +1497,8 @@ def pop_default(l: list[Any], i: int, default: Any) -> Any:
 
     # Only for AMD at this moment.
     # TODO: put this into a method
+    diff_file_url = None
     if is_amd_daily_ci_workflow:
-        diff_file_url = None
         if not (prev_workflow_run_id is None or prev_workflow_run_id == ""):
             ci_artifacts = get_last_daily_ci_reports(
                 artifact_names=None,