(a) where vacancies cannot be filled from an eligible list because of restrictions on filling vacancies based upon a financial emergency, the Chief Administrator of the Courts may extend the duration of that eligible list up to a period equal to the length of such restriction against the filling of vacancies; and

(b) in exceptional circumstances and where an examination already has been scheduled for a title, the Chief Administrator may extend the duration of an eligible list for that title up to the date of the certification of the new eligible list resulting from that examination, but in no event for more than one year.