How can I delete the automatically generated "About the X Category" topic?

[exlabs (Daniel)]

For our particular application this is useful for top-level categories, but do not need it for sub-categories.

How can I delete this topic? It seems it is not possible.

[Moin]

Deleting "About xxx Category

These topics cannot be deleted, no. If you don’t want them, leave the default text (so it isn’t used as a category description) and unlist the topic. Users won’t be able to see them.