No delivery really means "no more delivery".
How do I explain this..... The pump doesn't have a way to determine where exact zero is in a reservoir, so it leaves a little leeway, 5-10 units. This way people don't get caught short, which is much worse then having some left over that gets thrown out.
I've never had an "empty cartridge. no delivery" alarm, however, I have had an "empty cartridge" after a bolus, then a "no delivery" because the pump wanted to give a basal almost immediately after wards. If it says empty cartridge it will not deliver any more.
Now, I don't recommend this, however, I have run out in the middle of the day at work. I disconnect my pump, pull the reservoir out, rewind (some), place a hard, small object in the end of the reservoir (so the pump's push rod hits this object which in turn pushs the reservoir's piston). When I do the load the pump's push rod hits this object and it fools it into thinking there is more insulin in the reservoir. I then do a prime and reattach. The pump will continue pumping, using the 5-10 units that are remaining until it can't pump anymore. It alarms saying there is an inclusion because it can't push the piston anymore. Like I said I don't recommend this because of lots of unknown factors, air bubbles, etc., however, I don't want to go high because the pump won't give me the remaining insulin, and I feel very comfortable with my pump's functions.