Do not submit empty fields.

Author: robgietema

frontend/packages/volto-form-block/src/schemaFormBlock/ViewSchemaForm.jsx

@@ -13,6 +13,7 @@ import {
   includes,
   keys,
   map,
+  omitBy,
   pickBy,
   without,
   isObject,
@@ -115,6 +116,9 @@ const FormBlockView = ({ data, id, properties, metadata, path }) => {
       ),
     );
 
+    // Remove empty values
+    submitData = omitBy(submitData, (value) => value === null);
+
     dispatch(submitForm(path, id, submitData, captcha))
       .then((resp) => {
         setSubmitted(true);