Fix checking invitation reponse

vroom.pl

@@ -1481,9 +1481,11 @@ websocket '/socket.io/:ver/websocket/:id' => sub {
           )
         );
       }
+      if (keys %{$invitations} > 0){
         delete $peer->{check_invitations};
         $self->add_peer($id, $peer);
       }
+    }
     $self->send(Protocol::SocketIO::Message->new( type => 'heartbeat' ));
   });