No notice of dishonour is necessary:

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