on DC once supply goes back to 0 unset supply flag
on DC once supply goes back to 0 unset supply flag


Former-commit-id: 5c5ac2fb8e453161237473931525384bb3d75edc
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin