Fix build without wasm feature enabled

src/dynamic_data/libraries/script_resolver.rs

@@ -55,7 +55,7 @@ pub enum ScriptCategory {
 }
 
 /// A basic empty script resolver, that always returns None.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct EmptyScriptResolver {
     /// A unique identifier so we know what value this is.
     pub identifier: ValueIdentifier,