Vertical tab is visible when all items are hidden

MR8 is ready for review

Hi jannakha, do you have the patch? I need to apply this for my site.
Thank you very much <3

@octaviosch
patch is on MR - https://git.drupalcode.org/project/simplify/-/merge_requests/8.diff

please review docs on git workflow:
- https://www.drupal.org/docs/develop/git/using-gitlab-to-contribute-to-dr... →
- https://www.drupal.org/docs/develop/git/using-gitlab-to-contribute-to-dr... →

After you install patch, please update status of this issue