Fixes arrivals duplicate checking (#27)
Fixes arrivals duplicate checking (#27)

The check should be done BEFORE the docking_port is initialized
GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,Memendia/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,McBawbaggings/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,Memendia/HippieStation,Memendia/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation