Fix workflow validation "CLIPLoader: Value not in list: device: 'None' not in ['default', 'cpu']" #2087

* custom workflow import did a destructive update of node object info
* as a result default values were also added for optional parameters (should only be required)

Author: Acly

ai_diffusion/comfy_workflow.py

@@ -1242,7 +1242,8 @@ def inputs(self, node_name: str, category="") -> dict[str, list] | None:
         inputs = node.get("input", {})
         if category:
             return inputs.get(category)
-        result = inputs.get("required", {})
+        result = {}
+        result.update(inputs.get("required", {}))
         result.update(inputs.get("optional", {}))
         return result