metadata is not a parameter

src/jflow/workflow.py

@@ -145,7 +145,7 @@ class Workflow(threading.Thread):
         self.params_order = []
         self.define_parameters(self.function)
         # add the metadata parameter
-        self.add_parameter_list("metadata", "Which metadata should be linked to this workflow")
+        self.metadata = []
         
         if self.id is not None:
             self.directory = self.manager.get_workflow_directory(self.name, self.id)