No error in swagger-parser when $ref to nothing

Hi, I tested this with the following spec:

openapi: 3.0.0
info:
  version: 1.0.0
  title: Issue 1190
  license:
    name: Apache-2.0
    url: 'http://www.apache.org/licenses/LICENSE-2.0.html'
paths:
  /example:
    get:
      operationId: example
      responses:
        '200':
          description: successful operation
          content:
            'application/json':
              schema:
                $ref: "#/components/schemas/XomeObj"
components:
  schemas:
    SomeObj1:
      type: object
      properties:
        lorem:
          type: array
          minItems: 1
          additionalProperties: false
          items:
            type: object
            properties:
              firstName:
                type: string
              lastName:
                type: string  

 And parser threw a warning:

- attribute paths.'/example'(get).responses.200.content.'application/json'.schema.#/components/schemas/XomeObj is missing

Please try updating to the latest parser version.

And let us know if this fixes the issue, or if the case happening to you is different.