fix a crash when asking subscription to a group (non-sense). close #372
fix a crash when asking subscription to a group (non-sense). close #372

ArchipelProject/Archipel,fr34k8/Archipel,ArchipelProject/Archipel,fr34k8/Archipel,ArchipelProject/Archipel,ruthger/Archipel,ruthger/Archipel,ArchipelProject/Archipel,CyrilPeponnet/Archipel,fr34k8/Archipel,fr34k8/Archipel,rmoorman/Archipel,ArchipelProject/Archipel,ruthger/Archipel,CyrilPeponnet/Archipel,rmoorman/Archipel,rmoorman/Archipel,rmoorman/Archipel,CyrilPeponnet/Archipel,CyrilPeponnet/Archipel,rmoorman/Archipel,fr34k8/Archipel,ruthger/Archipel,ruthger/Archipel,CyrilPeponnet/Archipel