StepRunner: ignore archived reagent kits when adding default reagents…

… to a step

s4/clarity/steputils/step_runner.py

@@ -340,10 +340,13 @@ def add_default_reagents(self):
         """
         For every required reagent kit in the step, the first active lot
         will be selected. If there are no active lots it will be omitted.
+        Archived kits will be ignored.
         """
         log.info("Adding default reagent lots.")
         lots = []
         for kit in self.step.configuration.required_reagent_kits:
+            if kit.archived:
+                continue
             for lot in kit.related_reagent_lots:
                 if lot.status == "ACTIVE":
                     lots.append(lot)