MAINT: migrate bug fix into `Ensembler`
MAINT: migrate bug fix into `Ensembler`

mnicholl/MOSFiT,mnicholl/MOSFiT,guillochon/MOSFiT,villrv/MOSFiT,guillochon/MOSFiT,mnicholl/MOSFiT,villrv/MOSFiT,bmockler/MOSFiT,guillochon/FriendlyFit,bmockler/MOSFiT,guillochon/MOSFiT