caching: Handle None outputs tuple case (comfyanonymous#10637)

Author: rattus128

comfy_execution/caching.py

@@ -399,6 +399,8 @@ def _ram_gb():
  ram_usage = RAM_CACHE_DEFAULT_RAM_USAGE
  def scan_list_for_ram_usage(outputs):
  nonlocal ram_usage
+ if outputs is None:
+ return
  for output in outputs:
  if isinstance(output, list):
  scan_list_for_ram_usage(output)