fix race condition on relayer calling with 0 height on status
fix race condition on relayer calling with 0 height on status


Former-commit-id: d426e5191227c8517c0634c0f06ae21fb1c5793a
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin