fix: fix the problem with empty objects in intersections

[shenbenson]

This fixes the problem with empty objects like:

      requestBody:
        content:
          application/json:
            schema:
              allOf:
                - type: object
                  properties: {}
                - $ref: '#/components/schemas/ESignatures'

Objects like these causes ReadMe to not render the endpoint properly.

Manually tested locally in entity-validation, and it addresses the problem while not affecting other parts of the file:

Ticket: DX-2181

[starfy84]

LGTM

[github-actions]

🎉 This PR is included in version @api-ts/[email protected] 🎉

The release is available on npm package (@latest dist-tag)

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