It was in my understanding, that if a doctor were roleblocked, he would not be able to heal.
https://oi51.tinypic.com/2h3cv9f.jpg
Mafia targeting sheriff.
https://oi53.tinypic.com/ease40.jpg
Sheriff is attacked and saved.
https://oi53.tinypic.com/2emzlns.jpg
Doctor saved him but was roleblocked.
https://oi53.tinypic.com/if213a.jpg
Consort roleblocking doctor.
https://oi56.tinypic.com/2ebguw4.jpg
Endgame screen showing player names vs username. Also note that there was only one doctor, so the roleblocked doctor's heal went through.