Fixed error for comments with a list

[ulyssear]

What GitHub issue does this PR apply to?

Resolves #700
Resolves #712

What changed and why?

Joins elements with a new line feed character in comments if it's an instance of list.

(If editing Django app) Please add screenshots

Checklist

• I claimed any associated issue(s) and they are not someone else's
• I have looked at documentation to ensure I made any revisions correctly
• I tested my changes locally to ensure they work
• (If editing Django) I have added or edited any appropriate unit tests for my changes

Any additional comments or things to be aware of while reviewing?

No.

[geekygirlsarah]

Yep, this would probably be the problem. Thanks for fixing it so quickly (despite my not-quick approving)! I appreciate it.