Rich helps always show parameter default: None for parameters that haven't any default value

[AlirezaTheH]

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Commit to Help

• I commit to help with one of those options 👆

Example Code

import typer

def main(name: str):
    typer.echo(f'Name: {name}')

if __name__ == '__main__':
    typer.run(main)

Description

Rich helps always shows parameter default: None for parameters that haven't any default value.

Operating System

macOS

Operating System Details

No response

Typer Version

0.6.1

Python Version

3.10

Additional Context

No response