Fix an uninitialized var

vroom.pl

@@ -1618,6 +1618,7 @@ any '/api' => sub {
     if ($self->session($room->{name}) && $self->session($room->{name})->{role}){
       # If we just have been promoted to owner
       if ($self->session($room->{name})->{role} ne 'owner' &&
+          $self->get_peer_role({room => $room->{name}, peer_id => $peer_id}) &&
           $self->get_peer_role({room => $room->{name}, peer_id => $peer_id}) eq 'owner'){
         $self->session($room->{name})->{role} = 'owner';
         $self->associate_key_to_room(