No image for image list loader throws exception.

[MilitantHitchhiker]

Add exception handling please.

|CR Load Image List: No images found.
!!! Exception during processing!!! object of type 'NoneType' has no len()
Traceback (most recent call last):
File "D:\AI\ComfyUI\ComfyUI\execution.py", line 151, in recursive_execute
output_data, output_ui = get_output_data(obj, input_data_all)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "D:\AI\ComfyUI\ComfyUI\execution.py", line 95, in get_output_data
output_is_list = [False] * len(results[0])
^^^^^^^^^^^^^^^
TypeError: object of type 'NoneType' has no len()

[MilitantHitchhiker]

Submitted a pull request with fix.