remove numm value fields from crosswords json response

[marjisound]

What is the value of this and can you measure success?

This PR fixes the editions crossword json response by applying withoutNull Recursively to handle nested objects by recursively applying the transformation.

The crosswords json response is having some fields with null value and DCR is failing in json validation.

What does this change?

Screenshots

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Checklist

• Tested locally, and on CODE if necessary
• Will not break dotcom-rendering
• Will not break our database – if updating CAPI, updated and committed the database files
• Meets our accessibility standards
  • Tested with screen reader
  • Navigable with keyboard
  • Colour contrast passed

[github-actions]

Deploy build 3476 of dotcom:frontend-all to CODE

All deployment options

• Deploy build 3476 of dotcom:frontend-all to CODE
• Deploy parts of build 3476 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.