fields query parameter does not work consistently across all response formats

[jordanpadams]

🐛 Describe the bug

curl --get https://pds.nasa.gov/api/search-sbnumd/1.0/bundles/urn:nasa:pds:gbo-kpno::4.0/collections --data-urlencode 'fields=Time_Coordinates.start_date_time' | json_pp

returns all fields

curl --get 'https://pds.nasa.gov/api/search-sbnumd/1.0/bundles/urn:nasa:pds:gbo-kpno::4.0/collections' --data-urlencode 'fields=pds:Time_Coordinates.pds:start_date_time' --header "Accept: text/csv"

returns a bunch of whitespace

🕵️ Expected behavior

This must be consistent 100% of the time. Even if we just support via text/csv and kvp+json, that will suffice for now. But that doesn't currently work.

📚 Version of Software Used

1.0.2

🩺 Test Data / Additional context

🏞Screenshots

🖥 System Info

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

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🦄 Related requirements

related to NASA-PDS/pds-api#209

⚙️ Engineering Details

[al-niessner]

fixed on branch 1.0.3

[jordanpadams]

fixed per #175 (I think?). let's test it out and see...