Hiding fields with business rules - empty row remains

Hi,

I have following fields in a custom entity:

- reachability type

- e-mail

- number

- website

I have set the fields e-mail, number and website to not to be displayed on the form by default. And I have setup business rules, which then set the visibility of this fields to visible, if the if condition is true.

e.g. if reachability type "mobile" is chosen, I display the field "number".

At the beginning none of these three fields are displayed, since you have to select a reachability type first. BUT unfortunately for these three fields a blank line is shown on the form and afterwards the next fields are displayed.

Is there any way to remove these empty lines from the form?

thx Thomas