"Document User Text" row disappear when the "Value" ist empty


I set a list of Document User text Keys, to use them in the writing head of my drawings. As example “Name” and “Date”, so I don’t need to fill out every time and have them together in a List. Very usefull…

My problem:
If I have nothing written in den “Value” column and close the “Properties” Dialog, the row will be deleted and the Attribute User Text have no longer his reference.

Key/Value tables can’t have empty or null values. Perhaps a default value?