If the Trustee or any Holder of Bonds has instituted any proceeding to enforce any right or remedy under this Indenture and such proceeding has been discontinued or abandoned for any reason, or has been determined adversely to the Trustee, or such Holder of Bonds, then and in every such case the District, the Trustee and the Holders of Bonds shall, subject to any determination in such proceeding, be restored severally and respectively to their former positions hereunder, and thereafter all rights and remedies of the Trustee, and the Holders of Bonds shall continue as though no such proceeding had been instituted.