Set null as empty string value for input field

I have an input field mapped to an entity in my controller with a ngModel 2-way binding:

<input type="text" [(ngModel)]="entity.one_attribute" />


When I initialize my controller, I have this entity:

{ one_attribute: null }


If a user starts to fill in the field but does not submit the form immediately and empties the field, my entity is updated to become:

{ one_attribute: "" }


Is it possible to define that empty string should be changed to null automatically?

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