* @return optional user entity populated from the form
     */
    public static OptionalEntity<User> getUser(final CreateForm form) {
        return getEntity(form).map(entity -> {
            copyMapToBean(form.attributes, entity, op -> op.exclude(Constants.COMMON_CONVERSION_RULE));
            copyBeanToBean(form, entity, op -> op.exclude(ArrayUtils.addAll(Constants.COMMON_CONVERSION_RULE, "password")));

                stream(toAddresses).of(stream -> stream.forEach(address -> {
                    postcard.addTo(address);
                }));
                BeanUtil.copyMapToBean(dataMap, postcard);
            });
            saveInfo(messages -> messages.addSuccessSendTestmail(GLOBAL));
            updateProperty(Constants.NOTIFICATION_TO_PROPERTY, form.notificationTo);