Correctly handling a "not" type in input position

Author: blast-hardcheese

replit_river/codegen/client.py

@@ -831,9 +831,12 @@ def __init__(self, client: river.Client[Any]):
                                 exclude_none=True,
                               )
                             """
-        if isinstance(
-            procedure.input, RiverConcreteType
-        ) and procedure.input.type not in ["object", "array"]:
+        if (
+            (isinstance(procedure.input, RiverConcreteType)
+            and procedure.input.type not in ["object", "array"])
+            or isinstance(procedure.input, RiverNotType)
+            or procedure.input is None
+        ):
             render_input_method = "lambda x: x"
 
         assert (