V3 Nodes: refactor check for fingerprint_inputs and check_lazy_status

comfy_api/v3/helpers.py

@@ -5,7 +5,10 @@ def first_real_override(cls: type, name: str, *, base: type) -> Optional[Callabl
     """Return the *callable* override of `name` visible on `cls`, or None if every
     implementation up to (and including) `base` is the placeholder defined on `base`.
     """
-    base_func = getattr(base, name).__func__
+    base_attr = getattr(base, name, None)
+    if base_attr is None:
+        return None
+    base_func = base_attr.__func__
     for c in cls.mro():                       # NodeB, NodeA, ComfyNodeV3, object …
         if c is base:                         # reached the placeholder – we're done
             break

comfy_api/v3/io.py

@@ -1115,8 +1115,6 @@ class ComfyNodeV3:
         """Optionally, define this function to fingerprint inputs; equivalent to V1's IS_CHANGED."""
         raise NotImplementedError
 
-    fingerprint_inputs = None
-
     @classmethod
     def check_lazy_status(cls, **kwargs) -> list[str]:
         """Optionally, define this function to return a list of input names that should be evaluated.
@@ -1133,8 +1131,6 @@ class ComfyNodeV3:
         """
         return [name for name in kwargs if kwargs[name] is None]
 
-    check_lazy_status = None
-
     @classmethod
     def GET_SERIALIZERS(cls) -> list[Serializer]:
         return []