Unable to unfollow a cube that has been deleted

[Badaro]

Describe the bug
There doesn't seem to be a way to "unfollow" a cube you had followed in that past that has been deleted by its owner.

To Reproduce

1. Go to /user/social.
2. Click on a cube you have followed in the past, but that has been deleted.
3. You won't be able to reach the cube page, instead being redirected to a "Not Found" page (/cube/overview/404).
4. There is no option to unfollow the cube in the social page as well.

Expected behavior
There should be an option either in the social page or in the "Not Found" page to unfollow a deleted Cube. Another option is to have follows be automatically deleted when the owner deletes a Cube.

Desktop (please complete the following information):

• OS: Windows
• Browser: Firefox
• Version: 121.0.1

Additional context
This is the cube I had previously followed but is no longer available.
https://cubecobra.com/cube/overview/ud1