Recipients can't be blank in builds email service
After migration of CI services to gitlab services (v8.3 thought) emails about CI-builds can't be sent only to pusher. However, it still works on previously enabled projects.
If i tried to enable 'builds emails' service for project with checkbox 'add pusher' active and no recipients specified, then i got error 'Recipients can't be blank'.
Idea is to send emails about builds (broken or not) only to pusher. Now we should specify at least one email even if 'add pusher' checkbox active.