correction in CapacityStationController

dream/simulation/applications/CapacityStations/CapacityStationController.py

@@ -44,6 +44,7 @@ class CapacityStationController(EventGenerator):
         # attribute that shows if we prioritize entities that can finish work in this station in the next interval
         self.prioritizeIfCanFinish=bool(int(prioritizeIfCanFinish))
         # the total assemblySpace in the system
+        if hasattr(G, 'extraPropertyDict'):
             self.assemblySpace=float(G.extraPropertyDict.get('assemblySpace', float('inf')))
         self.method=self.steps