clean previous invoicing period if we’re re-generating invoices
clean previous invoicing period if we’re re-generating invoices

dimagi/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,SEL-Columbia/commcare-hq,qedsoftware/commcare-hq,puttarajubr/commcare-hq,SEL-Columbia/commcare-hq,puttarajubr/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,puttarajubr/commcare-hq