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.