images folder might not exist

server/GameServer/Commands.lean

@@ -688,6 +688,7 @@ open IO.FS System FilePath in
 /-- Copies the folder `images/` to `.lake/gamedata/images/` -/
 def copyImages : IO Unit := do
   let target : FilePath := ".lake" / "gamedata"
+  if ← FilePath.pathExists "images" then
     for file in ← walkDir "images" do
       let outFile := target.join file
       -- create the directories