Source, if no router is available, the pendingEntities list is not populated by the source

dream/simulation/Source.py

@@ -159,6 +159,7 @@ class Source(CoreObject):
         from Globals import G
         assert entity, 'cannot append None entity'
         activeEntity=entity
+        if G.Router:
             # at the newly created entity to the pendingEntities
             G.pendingEntities.append(activeEntity)