[FIX] Ensure non-agg API doesn't error out when all matches lack pipeline data

[alyssadai]

• Fixes Non-agg API response can't handle matching subjects lacking pipeline data #368

Changes proposed in this pull request:

• Comments added to clarify steps in graph response reshaping
• Add mocked non-aggregated graph response where no subjects have pipeline info
  • Add test of API response for this query result case
• Handle NaNs for pipeline_name during graph response reshaping, to account for cases where there are no completed pipelines among matching sessions

Checklist

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• PR links to GitHub issue with mention Closes #XXXX
• Tests pass
• Checks pass
• If the PR changes the SPARQL query template, the default Neurobagel query file has also been regenerated

For new features:

• Tests have been added

For bug fixes:

• There is at least one test that would fail under the original bug conditions.

[coveralls]

Pull Request Test Coverage Report for Build 11565246440

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Details

• 29 of 29 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.1%) to 96.655%

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Totals
Change from base Build 11522278696:	1.1%
Covered Lines:	809
Relevant Lines:	837

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💛 - Coveralls

[surchs]

Thanks @alyssadai for addressing this. I have a question about the test that protects against a regression here in the future. Otherwise this all looks nice

🧑‍🍳

[neurobagel-bot]

🚀 PR was released in v0.4.1 🚀