Effect of waiver or delay in invoking remedy.

No waiver of any default or breach of duty or contract, whether by any holder of refunding bonds, or any trustee therefor, shall extend to or shall affect any subsequent default or breach of duty or contract or shall impair any rights or remedies thereon. No delay or omission of any bondholder or any trustee therefor to exercise any right or power accruing upon any default shall impair any such right or power or shall be construed to be a waiver of any such default or acquiescence therein.