When, from any cause, none of the fiduciary commissioners can act as to any matter or matters which may be passed on under the provisions of this chapter, the county commission or tribunal referred to in section one of this article, may appoint some other person to act as to such matter or matters. That person shall have the power and compensation and perform the duties of a fiduciary commissioner. When any fiduciary commissioner resigns, or is removed, the county commission or tribunal may provide for the completion of the matters previously referred to that commissioner.