I usually output an empty list or None, which will both output as an empty orange wire:
Edit: For context, I’ve developed this practice over the years for structuring GHPython code. Where steps 5 and 6 are the relevant ones here (i.e. empty outputs and check inputs before running any code):
211102_GH103_GHPython_BestPractice_Deleuran.pdf (174.9 KB)