[BUG] [PYTHON] Empty security requirement generates code with syntax error

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

An API endpoint with empty security requirements generates code for Configuration.auth_settings() that contains a syntax error. This appears to be allowed in clause 4.8.30.1 and is given as an example in 4.8.30.2.1.

openapi-generator version

7.1.0

OpenAPI declaration file content or url

components:
  securitySchemes:
    openapi_authorization:
      in: HEADER
      name: Authorization
      type: apiKey
info:
  version: "1.0"
  title: Test
openapi: 3.0.0
paths:
  /foo:
    get:
      responses:
        "200":
          content:
            application/json: {}
          description: asdf
      security:
        - openapi_authorization: []

Generation Details

openapi-generator generate -g python -i schema.yml

Steps to reproduce

1. Create a YAML file with the above content and run the CLI with the given settings and that file.
2. In the generated client, go to the definition for Configuration.auth_settings()

Related issues/PRs

N/A

Suggest a fix

I think an empty list of requirements means the return value should be an empty dict? In any case, I think we need to fix this or change the code that calls it to make isApiKey equal to false if the security requirements list is empty.

Start with modules/openapi-generator/src/main/resources/python/configuration.mustache, especially the auth_settings() section referenced in the issue. Run the shown openapi-generator generate -g python command with the provided schema, then inspect the generated Configuration.auth_settings() output; done means the empty security requirement produces syntactically valid Python.