(bug): No error thrown when trying to remind a group post, when not a group member

Summary

When you are not a member of a group, if you try to remind a post from it, it will seem like it worked fine. When you check your channel it does not.

Steps to reproduce

1. Pick a group, e.g. https://www.minds.com/groups/profile/844220536770330624/feed
2. Make sure you are NOT joined
3. Repost something
4. Check channel and observe that the remind has not happened
5. Go back and join and remind same post.

Platform information

Cross platform web replicated on Chromium / Ubuntu 18.04

What is the current bug behavior?

No repost is made.

What is the expected correct behavior?

Either reposting when not a group member should be allowed, in which case it needs fixing, or an appropriate error message should be displayed.

Relevant logs and/or screenshots

(Paste any relevant logs - please use code blocks (```) to format console output, logs, and code as it's very hard to read otherwise.)

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)