1. When, by the terms of the will, the testator has directed or expressed the desire that no bond shall be required, such direction or expression shall be construed to be a waiver of the posting of a bond by the fiduciary for all purposes, and no bond shall be required unless the court for good cause finds it proper to require one; if no bond is initially required, the court may nevertheless, for good cause, at any subsequent time require that a bond be given.
 2. Unless otherwise required by the instrument creating the relationship, or by order of court, bank and trust companies shall not be required to provide any bond.