[7TV] `500 Internal Server Error` on channels without 7tv emotes.

[Sneakpeakcss]

It seems like https://github.com/adiq/temotes/pull/2 is no longer working for 7tv. All other services correctly return an empty array:

https://emotes.adamcy.pl/v1/channel/testuser/emotes/twitch.ffz.bttv

But all or 7tv with either a username or ID returns an error "error": "runtime error: index out of range [0] with length 0":

https://emotes.adamcy.pl/v1/channel/testuser/emotes/7tv