Fix: prevent going to next page if amount is zero
Fix: prevent going to next page if amount is zero

fr34k8/copay,msalcala11/copay,msalcala11/copay,matiu/copay,cmgustavo/copay,msalcala11/copay,msalcala11/copay,matiu/copay,gabrielbazan7/copay,cmgustavo/copay,cmgustavo/copay,fr34k8/copay,matiu/copay,gabrielbazan7/copay,fr34k8/copay,fr34k8/copay,cmgustavo/copay,gabrielbazan7/copay,gabrielbazan7/copay,matiu/copay