Fix the condition where all containers are assigned
Fix the condition where all containers are assigned

A dummy shipment is added as a drop target when all shipments containers are assigned
DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb,DiamondLightSource/SynchWeb