only call __updated() if we get a hook

Closes #4196.

Author: SteffenDE

assets/js/phoenix_live_view/view.js

@@ -606,7 +606,8 @@ export default class View {
 
     patch.after("updated", (el) => {
       if (updatedHookIds.has(el.id)) {
-        this.getHook(el).__updated();
+        const hook = this.getHook(el);
+        hook && hook.__updated();
       }
     });