An empty textfield sends empty string instead of null

Hello, I think i have found a minor bug regarding textfields in forms.

If you completely ignore the field and start a process, the field value is null, same if you click on the field but don't type anything.

The problems appears when you start writing in the field, and then clear the field completely.
Now the field sends an empty string instead "".

I would assume that it should eigher always send an empty string, or always send null. Since the field is empty in all cases.

I've tried it myself a few times by logging the variable value.

If you have any questions, just ping me.

Reproduce el comportamiento del formulario con un campo de texto que se deja intacto, se enfoca sin escribir y se rellena antes de vaciarlo. Compara los valores enviados en cada caso e identifica dónde se serializa el campo vaciado. Se considera completado cuando el comportamiento del campo vacío es coherente y está cubierto por una prueba de regresión.

Escrito por el modelo de indexación a partir del texto del issue.