(3) Where in this Act any expressions are used requiring or authorising or inferring that any act or thing is to be done in the presence of the agents of the candidates, such expressions shall be deemed to refer to the presence of such agents of the candidates as may be authorised to attend at the time and place where such act or thing is being done and the non-attendance of any agent at such time and place shall not if such act or thing be otherwise duly done, in any way invalidate the act or thing done. A candidate may himself or herself undertake the duties which any duly appointed agent of his or her might have undertaken or may assist his or her agent in the performance of such duties and may, subject to this Act, be present at any place at which his or her agent may, in accordance with this Act, attend.