flight safety is quite right about the FAR 121.590.
Hold West...this may not be as nutty as you might think...the plane may have been empty, ferrying to a new trip...pilots may have been told initially that a flight attendent was already at the new airport and off we go into the wild blue yonder...only to get a message from the company that the f/a was somewhere back at the ranch...rather than land and have to get redispatched, a quick go around was much easier on the paperwork and reduced the cycles on the plane by one.
Airline flying is like making sausage...if you saw it being made, you might stay on the ground (round?;-0 )