BUG: allow admins to save community guidelines without content

[larssondenise]

Describe the bug When I create community guidelines, but I don't want them anymore, I can't delete and save them

To Reproduce Steps to reproduce the behavior:

1. Go to a Space with community guidelines, or add guidelines to a space
2. Delete the title and text in the description
3. Try to save
4. See update button is greyed out

Expected behavior

• I want to be able to delete my title and text
• If community guidelines are empty, do not show them on the community tab

Screenshots