Response type missing when using Fetch with empty schema

[AllieJonsson]

What are the steps to reproduce this issue?

1. Use the following schema

openapi: 3.0.1
info:
  title: Test
  version: v1.0
paths:
  /test:
    get:
      description: Test
      operationId: test
      responses:
        200:
          description: Test
          content:
            application/json:
              schema:
                example: {}

2. Generate with client: fetch

What happens?

export type testResponse = {
  data: ;
  status: number;
  headers: Headers;
}

What were you expecting to happen?

export type testResponse = {
  data: unkown;
  status: number;
  headers: Headers;
}

[AllieJonsson]

Also, when using this schema:

openapi: 3.0.1
info:
  title: Test
  version: v1.0
paths:
  /test:
    get:
      description: Test
      operationId: test
      responses:
        200:
          description: Test
          content:
            application/json:
              schema:
                example: {}
        400:
          description: Error
          content:
            application/json:
              schema:
                type: string

this is generated:

export type testResponse = {
  data: string;
  status: number;
  headers: Headers;
};

which is wrong, since data should be unknown, which in turn generates another error: