Whoever, intending to facilitate, or knowing it to be likely that he will thereby facilitate, the commission of an offence punishable with imprisonment, voluntarily conceals, by any act or illegal omission, the existence of a design to commit such offence, or makes any representation which he knows to be false respecting such design, shall, if the offence is committed, be punished with imprisonment for a term which may extend to one-fourth, and if the offence is not committed, to one-eighth of the longest term provided for that offence; or with such fine as is provided for the offence, or with both.