[Bug]: Error message occured when clicking agents icon in demo ui.

### What happened?

When I try to click agents icon in demo ui, below message occured, so I can't add agents by GUI, please help check.
"Sorry, there was an error. Please contact the developer."

here is the server error:
Failed to read agents All connection attempts failed
e 1 validation error for agents_list
0
Input should be a valid list [type=list_type, input_value=None, input_type=NoneType]
For further information visit https://errors.pydantic.dev/2.11/v/list_type
INFO: 127.0.0.1:63135 - "POST /__ui__ HTTP/1.1" 200 OK
ERROR:root:**Mesop Developer Error:** from [agents_list](https://mesop-dev.github.io/mesop/components/agents_list/) component:
\- __0__: Input should be a valid list

please help provide a method or workaround to ignore this message.

### Relevant log output

```shell

```

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct