handle case where no ships in list

src/packet/login.rs

@@ -502,7 +502,7 @@ impl ShipList {
     pub fn new(ships: Vec<ShipListEntry>) -> ShipList {
         ShipList {
             baseship: ShipListEntry {
-                menu: ships[0].menu,
+                menu: ships.get(0).map(|s| s.menu).unwrap_or(0),
                 item: 0,
                 flags: 0,
                 name: utf8_to_utf16_array!("Ship", 0x11),