Downloader - Silently return no repos when incorrect permissions

### What Red version are you using?

3.5.22

### Cog name

Downloader

### Command name

repo list or cog update

### What did you expect to happen?

To list the repos available or update the cogs.
Or if the permissions are wrong, to send something or log it in the console.

### What actually happened?

It returns "There are no repos installed." or "There were no cogs to check."

### How can we reproduce this error?

1. Change the owner of the repos folder. (Eg: chown debian:debian repos)
2. Restart the bot.
3. Use the repo list or cog update command.

### Anything else?

_No response_