Manage group node does not allow to hide the last widget

### Custom Node Testing

- [ ] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

The last widget should be allow to be hidden.

### Actual Behavior

### Steps to Reproduce

Just try to hide the last widget of the last node

### Debug Logs

```powershell
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### Other

_No response_