We check that when the slug is empty and you have no parents, then you are the homepage
Now, if there's already a home we set the slug even if it's empty
Checking that a nested page can't have an empty slug
Merge branch 'features/empty-slug-home'
Bad testing caused a false positive :(

Now we really test that a page with an empty slug and a parent doesn't get the empty slug
Merge branch 'features/empty-slug-home'