UI renders the "Response content type" Drop down for operations with no produces

For the OpenAPI 2.0 document below, Swagger UI renders the Response content type drop down and tries to pass an Accept header even though the DELETE operation does not have a produces: value

swagger: "2.0"
info:
  version: "1"
  title: Delete prompts for Accept media type
  description: Delete prompts for Accept media type
basePath: /delete-accept
schemes:
- "http"
paths:
  /models/{modleId}:
    delete:
      summary: Delete a model
      description: "Even though this operation does not produce anything,
        Swagger UI still prompts for and passes the Accept: header"
      operationId: deleteModel
      parameters:
      - name: modelId
        in: path
        required: true
        type: string
        description: The ID of the model to delete
      responses:
        204:
          description: No Content. The model was deleted.
        404:
          description: Not Found

Try it out -> execute shows the command:

curl -X DELETE "http://localhost/delete-accept/models/{modleId}" -H "accept: application/json"

The screenshot shows the rendering

Reproduce the issue in Swagger UI with the provided OpenAPI 2.0 document and inspect the response content type control and generated request. Done means a DELETE operation without a produces value has no Response content type dropdown and does not send an Accept header; verify the generated curl command.