Minor patch `convert_nx_to_pyg` #280

[rg314]

Reference Issues/PRs

Fixes #280

What does this implement/fix? Explain your changes

What testing did you do to verify the changes in this PR?

Pull Request Checklist

• [ ] Ran python -m py.test tests/ and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., python -m py.test tests/protein/test_graphs.py)
• [ ] Checked for style issues by running black . and isort .

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