chore: adjusts block and array schemas to store undefined instead of empty arrays by default

test/fields/config.ts

@@ -57,6 +57,7 @@ export default buildConfig({
   localization: {
     defaultLocale: 'en',
     locales: ['en', 'es'],
+    fallback: true,
   },
   onInit: async (payload) => {
     await payload.create({

test/fields/int.spec.ts

@@ -276,13 +276,13 @@ describe('Fields', () => {
       });
     });
 
-    it('should return empty array for arrays when no data present', async () => {
+    it('should return undefined arrays when no data present', async () => {
       const document = await payload.create<ArrayField>({
         collection: arrayFieldsSlug,
         data: arrayDoc,
       });
 
-      expect(document.potentiallyEmptyArray).toEqual([]);
+      expect(document.potentiallyEmptyArray).toBeUndefined();
     });
 
     it('should create with ids and nested ids', async () => {