It's not unusual for a board manufacturer to design a single board with a few different configurations of components, and simply not populate the ones that aren't needed. Margins are super slim, after all, and they would not hesitate to omit a part that might only cost a fraction of a cent.
I can't see from the picture what it is, but it could be some power related thing, and if the feature is not the board you wouldn't need it's power generator either.