I was helping a friend requeen a hive that he started from a package this May. For a month now all there has been is drone cells that are capped. I checked it 10 days ago and ordered a queen for him. When we opened the hive up today,there was a queen cell with no larvae in it among the drone cells. I cut it off anyway and introduced the queen cage,after I shook all the frames out on the ground. Is this common? Its the first time I have noticed this in any hive.