[ PYTHON ] Bug generating url encoded form data

Description

Hey Swagger Team!
When setting up a client to send url encoded form data I am getting a strange bug where the python client code that is generated is not runnable because of syntax issues. Specifically it creates some if statements that have nothing inside of them. I'm new to Swagger so there is potential for a bug in my YAML, but I followed the docs closely and the swaggerhub linter flagged no errors. After reaching out to the swaggerhub team they suggested I come talk to you all.

Swagger-codegen version

I am downloading the client code using the Swagger Hub web tool

Swagger declaration file content or url

/preauth:
    post:
      tags:
        - preauth
      summary: Call to be made before authentication
      description: Determine if a user should be prompted for 2fa
      operationId: duopreauth
      requestBody:
        content:
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/preauth_request'
      parameters:
        - in: header
          name: Date
          schema:
            type: string
            format: date
        - in: header
          name: Host
          schema:
            type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/preauth_response'
        '400':
          description: Invalid status value
      security:
        - duo_auth_header: []

Here is the referenced component

components:
  schemas:
    preauth_request:
      type: object
      properties:
        ipaddr:
          type: string
        username:
          type: string

Command line used for generation

Generated via the swaggerhub website

Steps to reproduce

1. Generate python client using the above yaml or something like it
2. Grab the sample client code from the README
3. Try to run that sample client
4. Get the error about invalid syntax

Related issues/PRs

None that I could find

Suggest a fix/enhancement

The generated python code looks like this

 form_params = []
 local_var_files = {}
 if 'ipaddr' in params:
        # noqa: E501 
 if 'username' in params:
        # noqa: E501

body_params = None

it seems like the form_params variable should be getting updated inside those if blocks but it's not. It also looks like some part of the code generation is expecting there to be a line there because it tried to turn linting off for it haha.

Let me know if there is any more information I can provide!
Xander

Start by reproducing the issue with the provided OpenAPI YAML and the generated Python client, then run the sample client from the README to confirm the syntax error. Inspect the Python generation templates or entry point responsible for url-encoded form data; done means the generated client is runnable and handles both form fields without empty conditional blocks.