Fix bug in weapon switching

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/player/player.dart

@@ -61,12 +61,19 @@ class Player {
 
   void updateWeaponSwitch() {
     if (switchState == WeaponSwitchState.lowering) {
+      // If the map doesn't contain the pending weapon, stop immediately
+      if (weapons[pendingWeaponType] == null) {
+        switchState = WeaponSwitchState.idle;
+        return;
+      }
+
       weaponAnimOffset += switchSpeed;
       if (weaponAnimOffset >= 500.0) {
         weaponAnimOffset = 500.0;
 
-        // Grab the pending weapon from inventory, default to pistol if something goes wrong
-        currentWeapon = weapons[pendingWeaponType ?? WeaponType.pistol]!;
+        // We already know it's not null now, but we can keep the
+        // fallback to pistol just to be extra safe.
+        currentWeapon = weapons[pendingWeaponType]!;
 
         switchState = WeaponSwitchState.raising;
       }