ImageScaleByAspectRation and empty mask on input error

[AlexK98]

Hello,

Thanks for nodes pack.
Found an error. When there is input on Mask parameter, but there is no actual mask coming from the source then UltimateSD Upscale fails with the following error message. If no mask param connected from Load Image to ImageScaleByAspectRation no error happens.

`!!! Exception during processing !!! object of type 'NoneType' has no len()

Traceback (most recent call last):
File "F:\ComfyUI_windows_portable\ComfyUI\execution.py", line 498, 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 "F:\ComfyUI_windows_portable\ComfyUI\execution.py", line 316, 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 "F:\ComfyUI_windows_portable\ComfyUI\custom_nodes\comfyui-lora-manager\py\metadata_collector\metadata_hook.py", line 165, in async_map_node_over_list_with_metadata
results = await original_map_node_over_list(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "F:\ComfyUI_windows_portable\ComfyUI\execution.py", line 290, in _async_map_node_over_list
await process_inputs(input_dict, i)
File "F:\ComfyUI_windows_portable\ComfyUI\execution.py", line 278, in process_inputs
result = f(**inputs)
^^^^^^^^^^^
File "F:\ComfyUI_windows_portable\ComfyUI\custom_nodes\comfyui_ultimatesdupscale\nodes.py", line 133, in upscale
shared.batch = [tensor_to_pil(image, i) for i in range(len(image))]
^^^^^^^^^^
TypeError: object of type 'NoneType' has no len()`