What should be done if a question is no longer of any value for the original asker and probably neither for anyone else? For example this question was about a command not working which turned out to be not reproducible, the same command works now. Nobody else encountered this problem before and also the asker doesn't have the problem anymore.
So what to do? Should there be an accepted answer like "Nevermind, can't reproduce"? Should the question just be left open? Or should it be closed as invalid or something else?
(Possibly related to this question, but not quite the same.)