When notice of dishonour is unnecessary.

No notice of dishonour is necessary--

1. (a) when it is dispensed with by the party entitled thereto;
2. (b) in order to charge the drawer, when he has countermanded payment;
3. (c) when the party charged could not suffer damage for want of notice;
4. (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;
5. (e) to charge the drawers, when the acceptor is also a drawer;
6. (f) in the case of a promissory note which is not negotiable;
7. (g) when the party entitled to notice, knowing the facts, promises unconditionally to pay the amount due on the instrument.