325. Whenever in this Title any expressions are used, requiring or authorizing any act to be done, or implying that any act or thing is to be done, in the presence of agents of the candidates, such expressions shall be deemed to refer to the presence of such agents of the candidates as are authorized to attend, and as have, in fact, attended at the time and place where such act or thing is being done; and the non-attendance of any agents or agent at such time and place shall not, if the act or thing is otherwise duly done, invalidate the act or thing done.