Fixing when class is missing.

galaxy.py

@@ -57,7 +57,7 @@ class GameData(object):
     def special_ports(self):
         """ Save the special class ports 0, 9 """
         return {
-            p: self.ports[p] for p in self.ports if self.ports[p]["class"] in (0, 9)
+            p: self.ports[p] for p in self.ports if 'class' in self.ports[p] and self.ports[p]["class"] in (0, 9)
         }
 
     def display(self):