[Backport] Fixing method total_closed_points_by_date for milestone model
[Backport] Fixing method total_closed_points_by_date for milestone model

taigaio/taiga-back,dayatz/taiga-back,dayatz/taiga-back,dayatz/taiga-back,xdevelsistemas/taiga-back-community,taigaio/taiga-back,taigaio/taiga-back,xdevelsistemas/taiga-back-community,xdevelsistemas/taiga-back-community