[#378] Make viewing forms in storybook more robust

Author: palagdan

src/model/FormGenerator.js

@@ -33,7 +33,7 @@ export default class FormGenerator {
     let formProperties;
     let form;
     return jsonld
-      .flatten(structure, {})
+      .compact(structure, {})
       .then((flattenedStructure) => {
         try {
           const [formQuestions, rootForm] =