Null Fields on Material Ui 5

[Bonfims]

Prerequisites

• I have searched the existing issues
• I understand that providing a SSCCE example is tremendously useful to the maintainers.
• I have read the documentation
• Ideally, I'm providing a sample JSFiddle, Codesandbox.io or preferably a shared playground link demonstrating the issue.

What theme are you using?

material-ui

Version

5.x

Current Behavior

On playground there is an "Null Fields" type example, which allows us to set type="null" on schema and set "title" and "description" fields to display on form to add extra information. However, the "title" field objects of type "null" are not rendered, and this issue can also be reproduced on playground too.

Expected Behavior

The "title" field on objects with type="null" need to be rendered too

Steps To Reproduce

On playground https://rjsf-team.github.io/react-jsonschema-form/, with theme material-ui-5, on "Null Fields" example

Environment

- OS: Ubuntu 20.04
- Node: 20.9.0
- npm: 10.1.0

Anything else?

No response

[Bonfims]

I noticied that a can avoid this by setting optional object type, like:

{
    "extra-info": {
            "title": "My title extra info",
            "description": "My extra info description",
            "type": ["null","object"]
    }
}

thank you all

[heath-freenome]

This actually is broken in all themes that aren't core, antd or bootstrap-4. If this is important to you, we'd love to see a PR with a fix in it. Thanks!