I think they will fix it soon.
Also why would you want to unvote for? It cost 1 Ark to unvote but it only cost .01 to send all to another address then vote.
So, you unvote then vote again for another delegate, total cost 2 Ark. If you creating another address then send all Ark to that address then vote for another delegate total cost would just 1.1 Ark. If the address bother you then just delete it after you empty it. Just some idea. I think as active delegate it would also bothering to see all empty addresses.