Edit: Listvalue attributes preselect the first value set in the edit service (redigeringstjänst)

[eri-blan]

Describe the bug
We noticed that if a listvalue attribute is set in the edit service, the first value is pre-selected even though the attribute value in the database is null. The previous behaviour seemed to be that no value was selected.
To Reproduce
Set up an edit service (redigeringstjänst) and add a few values to a list value attribute.

Expected behavior
If empty, no list value should be selected, since it leaves a possibility of errouneously adding a value that shouldn´t be set. Anyone else seeing this behaviour?

Hajk 3.14.1 develop