[tor-relays] unlisted exit relay

[Green Dream]

While visiting https://torstatus.blutmagie.de/ in Tor Browser, I noticed it
wasn't detecting the exit node I was being routed through as a relay.
Curious, I tried looking up the same IP in both Atlas and Globe, but
neither knows of a relay at this IP. The IP of this exit is 104.156.228.115.

What scenarios might cause this situation? As a Tor user, should I care? At
the very least, it seems desirable to always be able to research the nodes
you are using.
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