Fix: gen-next: do not take memberships not based on current blockchain
Fix: gen-next: do not take memberships not based on current blockchain

blaurent49/duniter,blaurent49/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,duniter/duniter