[BUG] [Python-fastapi] Missing return statement when endpoint has no description

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

The return statement is missing when the endpoint definition does not have a description.

openapi-generator version

v7.0.1 and snapshot version.

OpenAPI declaration file content or url

Here is an example of the OpenAPI declaration file content:

https://gist.github.com/reyescabello/6cd965708fd0b03e8eadb9f3c0c0a899

Generation Details

Generated with jar:

java -jar openapi-generator-cli.jar generate -i openapi.yml -g python-fastapi -o openapi_server

Steps to reproduce

If the definition of the endpoint in the yaml has the description of the endpoint, the code generated is:

paths:
  /v1/product:
    get:
      tags:
      - product
      summary: Find all products
      description: The user must have any permission in the application.
      operationId: findAllProducts
      parameters: []
      responses:

async def find_all_products(
) -> List[Product]:
    """The user must have any permission in the application."""
    return BaseProductApi.subclasses[0]().find_all_product()

However, if the description is not added, the generated code does not include the return statement:

paths:
  /v1/product:
    get:
      tags:
      - product
      summary: Find all products
      operationId: findAllProducts
      parameters: []
      responses:

async def find_all_products(
) -> List[Product]:
    ...

Start by running the documented openapi-generator-cli command with the linked OpenAPI example and the python-fastapi generator. Compare output for operations with and without descriptions; done means an endpoint without a description still includes its return statement rather than only an ellipsis.