When pulling back info on a closed question, I have come to expect `close_reason` to be a present key if there's a `close_date`. It seems that as of recently this is no longer true.

Proof: https://api.stackexchange.com/2.1/questions/164867?pagesize=10&site=askubuntu

What happened to this key? I need it. Can it be reintroduced please?

**Edit:** Just noticed this is [still in the API documentation][1], so I guess this is more of a bug. Again, please add this back to the API. We need it as part of Ask Ubuntu's ongoing cleanup effort.


  [1]: https://api.stackexchange.com/docs/types/question