Email shows fields that were left blank in form

[muratbinerbay]

Q	A
Bug report?	yes
Feature request?	no
BC Break report?	no
RFC?	no

Recently updated to the latest version (from 4.x) and fields that have been left blank in the form have [NO VALUE] in the email. Which was added here: #410
Tagged it as a bug because it looks wrong in the email in my opinion

Before the field would not be in the email when there was no value provided in the form. Do we need to remove the empty fields ourselves by implementing a new FormValuesOutputApplier or by overriding the twig templates?

[muratbinerbay]

I ended up overriding FormFieldWidget::parseSimpleField to pass an empty string instead.