[JAVA] 3.0.65 java stub generates method with no return value for get endpoints if $ref is used

Description

With 3.0.65 the methods that are generated for get endpoints (havent checked others) are not returning anything. Same specs worked with 3.0.64.

The generated code looks like this:

    public void whateverGet() throws ApiException {
        whateverGetWithHttpInfo();
    }

while with 3.0.64:

    public InlineResponse200 whateverGet() throws ApiException {
        ApiResponse<InlineResponse200> resp = whateverGetWithHttpInfo();
        return resp.getData();
    }

If i put the schema directly, without using the $ref, the generated code is having the return statement.

Swagger-codegen version

3.0.65

Swagger declaration file content or url

openapi: 3.0.1
paths:
  /whatever:
    get:
      responses:
        "200":
          $ref: "#/components/responses/WhateverGetResponse"

components: 
  responses: 
    WhateverGetResponse:
      description: test
      content:
        application/json:
          schema:
            type: object
            properties:
              name:
                type: string

Command line used for generation

java -jar ~/Downloads/swagger-codegen-cli-3.0.65.jar generate -i test.yaml -l java -o ./debug -DhideGenerationTimestamp=true

Steps to reproduce

just generate with 3.0.65

Related issues/PRs

Suggest a fix/enhancement

Start by reproducing the issue with test.yaml and the listed swagger-codegen CLI command, then trace Java generation for the whateverGet endpoint and its referenced response. Done means a $ref response generates a return type and resp.getData() as in 3.0.64, without regressing inline schemas.