law: Negotiable Instruments Act, 1881 
  98. When, notice of dishonor is unnecessary  
  No notice of dishonor 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 damages 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.