something went wrong: 'channel'

The app loads succesfully, the channels list appears in the sidebar, and the loading message persists.
Then I open the quick switcher and this message appears behind it:

```
Whoops, something went wrong:

'channel'
File "app.py", line 270, in get_channels_info
for channel in channels
File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
result = self.fn(*self.args, **self.kwargs)
File "app.py", line 266, in get_info
info = self.store.get_channel_info(channel.id)
File "/home/primary/Projects/Tools/sclack/sclack/store.py", line 120, in get_channel_info
return self.slack.api_call('channels.info', channel=channel_id)['channel']
```