swagger-ui response render bug

bug1760.yaml

swagger: '2.0'
info:
  version: 1.0.0
  title: Sample for testing display of reponse models
  description: |
    It seems like display of response models in swagger-ui depends on how they're defined.
    Particularly, whether they're referenced or in line. It should not matter.
basePath: /sample
produces:
  - application/json

paths:
  /test:
    get:
      summary: Example operation
      description: |
        All the different reponses should have an associated model ...
        The models are defined, but are they displayed?
      responses:
        200:
          description: This model is defined in-line, but since it's a 200, it shows up.
          schema:
            type: object
            properties:
              key:
                type: string
              value:
                type: string
        400:
          description: This model is defined with a reference to a definition object
          schema:
            $ref: '#/definitions/Error'
        403:
          $ref: '#/responses/Unauthorized'
        418:
          description: This model is defined in-line.
          schema:
            type: object
            properties:
              tea:
                type: string
                enum:
                  - earl grey
                  - sweet
                  - red rose
                  - green
              temp:
                type: string
                enum:
                  - hot
                  - iced
        500:
          $ref: '#/responses/ServerError'

responses:
  ServerError:
    description: Server failed to process your request.
    schema:
      type: object
      required: ["status", "message"]
      properties:
        status:
          type: string
          enum: ["error"]
        message:
          type: string

  Unauthorized:
    description: Only authorized users may make this request.
    schema:
      $ref: '#/definitions/Error'
    headers:
      WWW-Authenticate:
        type: string

definitions:
  Error:
    required:
      - code
      - message
    properties:
      code:
        type: integer
        format: int32
      message:
        type: string