I attempted to replace an electrical outlet that was not working. My voltage tester indicated nothing was working. A receptacle analyzer indicated nothing was working as well. but when opening it up, I was surprised to discover that the outlet was wired using two black wires and one white wire. There was a bare ground as usual. Surprisingly, I didn't see an additional white wire in the group of wires, so I got confused. I wired it back up the same way it was just with a new outlet and it still didn't work.
Why would this wiring configuration be like this? Was it a mistake?