7-13-155. Limitation on repayment of loan to reserve fund. Nothing in 7-13-151 through 7-13-156 permits the repayment of any loan to the reserve fund at any time unless all interest theretofore accrued on the bonds has been fully paid and all principal theretofore agreed to be paid in accordance with such redemption schedule as may be provided in the resolution or resolutions authorizing such bonds has been paid.