OpenAPI response may be declared even though Result is empty

[najeira]

When the Result is empty and HTTP Response is StatusOK, OpenAPI responses section gets declared even though SkipResponseBodyEncodeDecode is false.

design

package design

import (
	. "goa.design/goa/v3/dsl"
)

var _ = Service("testService", func() {
	Method("empty", func() {
		Result(Empty) // empty
		HTTP(func() {
			POST("/empty")
			Response(StatusOK) // OK not NoContent
		})
	})
})

got

openapi: 3.0.3
info:
    title: Goa API
    version: "1.0"
servers:
    - url: http://localhost:80
      description: Default server for testService
paths:
    /empty:
        post:
            tags:
                - testService
            summary: empty testService
            operationId: testService#empty
            responses:
                "200":
                    description: OK response.
                    content:
                        application/json:
                            schema:
                                type: string
                                format: binary
components: {}
tags:
    - name: testService

expect

part of responses:

            responses:
                "200":
                    description: OK response.

[raphael]

Good catch, thank you for the PR!