Z-image controlnet not working

### 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

I used the base workflow avalaible here for [Image controlnet workflow](https://docs.comfy.org/tutorials/image/z-image/z-image-turbo). I did put the controlnet safetensor in the correct path. and I got the error :

### Actual Behavior

Error at the loading of the controlnet node.

### Steps to Reproduce

I'm using comfyui v0.3.77 Python 3.13 Pytorch2.8+cu129, portable version on windows 11.

### Debug Logs

```powershell
!!! Exception during processing !!! cannot access local variable 'model' where it is not associated with a value
Traceback (most recent call last):
File "0:\\Documents\ComfyUI_windows_portable\ComfyUI\execution.py", line 510, in execute
output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "0:\\Documents\ComfyUI_windows_portable\ComfyUI\execution.py", line 324, in get_output_data
return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "0:\\Documents\ComfyUI_windows_portable\ComfyUI\execution.py", line 298, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "0:\\Documents\ComfyUI_windows_portable\ComfyUI\execution.py", line 286, in process_inputs
result = f(**inputs)
File "0:\\Documents\ComfyUI_windows_portable\ComfyUI\comfy_extras\nodes_model_patch.py", line 215, in load_model_patch
model.load_state_dict(sd)
^^^^^
UnboundLocalError: cannot access local variable 'model' where it is not associated with a value
```

### Other

_No response_