Workflow/PNG is not loaded if there is any uninstalled custom node.

### Custom Node Testing

- [x] 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

Workload shall be loaded with 'uninstalled' state(invalid, will be valid after custom nodes are ready)

### Actual Behavior

Workload itself is not loaded.

### Steps to Reproduce

Every single load(API/png) operation is executed.

### Debug Logs

```powershell
No logs even if I set --verbose DEBUG.
```

### Other

_No response_

---

*This issue is transferred from: https://github.com/comfyanonymous/ComfyUI/issues/11256*

Original issue was created by @aigengen5-ship-it at 2025-12-11T04:24:27.000Z

**Original Comments:**

@without-ordinary:

Sounds like another new manager issue. Is this on 0.4.0?

@christian-byrne:

Can you provide an example workflow that causes the error?

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-7426-Workflow-PNG-is-not-loaded-if-there-is-any-uninstalled-custom-node-2c86d73d3650817fa72ffab9e63767f3) by [Unito](https://www.unito.io)