98. No notice of dishonour is necessary-(a) when it is dispensed with by the party entitled thereto;(b) in order to charge the drawer when he has countermanded payment;(c) when the party charged could not suffer damage for want of notice;(d) when the party entitled to notice cannot after due search be found; or the party bound to give notice is, for any other reason, unable without any fault of his own to give it;(e) to charge the drawers when the acceptor is also a drawer;(f) in the case of a promissory note which is not negotiable;(g) when the party entitled to notice, knowing the facts, promises unconditionally to pay the amount due on the instrument.