Slack command integration broken in official discourse slack plugin

Thanks for reporting @mcwumbly. I’ve fixed it in

https://github.com/discourse/discourse-slack-official/commit/c7ce5722f041253ef0a2ee98a74303ac99b4ae8b

and added a test case for it. I’ve been involved in refactoring of the plugin but without existing test cases, there is a higher chance of me breaking stuff without knowing. Feel free to report any more bugs that you come across and I’ll get them sorted.