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src/jflow/workflow.py

@@ -142,7 +142,8 @@ class Workflow(threading.Thread):
         
         # define the parameters 
         self.params_order = []
-        self.define_parameters(self.function)
+        if self.function != None:
+            self.define_parameters(self.function)
         # add the metadata parameter
         self.metadata = []