changed undefined -> cart coercion

ablescript/src/variables.rs

@@ -349,9 +349,8 @@ impl Value {
     pub fn into_cart(self) -> Cart {
         match self {
             Value::Nul => HashMap::new(),
-            Value::Undefined => [(2, 4), (4, 2)]
+            Value::Undefined => [(Value::Undefined, ValueRef::new(Value::Undefined))]
                 .into_iter()
-                .map(|(k, v)| (Value::Int(k), ValueRef::new(Value::Int(v))))
                 .collect(),
             Value::Str(s) => s
                 .chars()