Default composer category (trust level) issue

[pedrom9604 (Pedro)]

Hi, I was able to reproduce this bug

Priority/Severity: Low

Platform: Desktop, Windows 10, Browser: Google Chrome 107.0.5304.107

Description: If a private category is selected as a default composer category, users that try to create a new topic, but have a lower trust level than the one(s) defined in the category, will have an empty default category and won’t be able to create a new topic unless they select a category that is reachable to them.

Reproducible steps:

1. Create a private category: Delete “everyone” from Security Groups and select a higher than zero trust level from the “Add a group” option.
   
   
2. Change default composer category to the new private category (Settings > Other)

3. Log in with a lower trust level user or create a new test user.

4. Create a new topic with the default category (blank).