assume get neighbours was successful

src/ship/ship.rs

@@ -331,12 +331,13 @@ impl<EG: EntityGateway> ServerState for ShipServerState<EG> {
     }
 
     fn on_disconnect(&mut self, id: ClientId) -> Vec<(ClientId, SendShipPacket)> {
+        // TODO: don't unwrap!
         let client = self.client_location.get_local_client(id).unwrap();
         let neighbors = self.client_location.get_client_neighbors(id).unwrap();
 
         let pkt = match self.client_location.get_area(id).unwrap() {
             RoomLobby::Room(room) => {
-                if let 0 = neighbors.len() {
+                if neighbors.len() == 0 {
                     self.rooms[room.0] = None;
                 }
                 let leader = self.client_location.get_room_leader(room).unwrap();