[FIX] do_merge now returns a tuple.
[FIX] do_merge now returns a tuple.

brain-tec/account-invoicing,Noviat/account-invoicing,open-synergy/account-invoicing,brain-tec/account-invoicing,kmee/account-invoicing,acsone/account-invoicing,kmee/account-invoicing,eezee-it/account-invoicing,acsone/account-invoicing