First thing to check is the hose from the reservoir to the nozzles. If it's cracked or detached you obviously won't get any fluid to the nozzles. Also check that the nozzles aren't plugged, although it would seem unlikely that all three would be plugged.
I haven't had the carpet out of my Leaf, but on every other car I've messed around with the line to the rear washer runs inside the cabin along outside edge of the passenger floorboard.
I guess I'll also mention that depending on where you're located and the current temperature, if you don't have winter fluid (lower freezing point) in the reservoir it could be frozen.