city map serialization fix

src/engine/net/client/msg/CityDataMsg.java

@@ -87,7 +87,11 @@ public class CityDataMsg extends ClientNetMsg {
         temp.putInt(cityList.size());
 
         for (City city : cityList)
-            City.serializeForClientMsg(city, temp);
+            try {
+                City.serializeForClientMsg(city, temp);
+            }catch(Exception e){
+                continue;
+            }
         temp.put((byte) 0); // PAD
 
         // Serialize runegates