Empty extended type/module with --include-extended-types

[stevapple]

Description

When using --include-extended-types and moving all extended APIs up to top-level with an extension file, DocC still creates entries for the extended type and module, which contains basically nothing.

Checklist

• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue.

Expected Behavior

Since there’s nothing, I would expect the entries to be omitted.

Actual behavior

There’s an "Extended Module" entry holding an "Extended Class" entry, which contains nothing.

Steps To Reproduce

https://swiftpackageindex.com/teco-project/teco-core/main/documentation/tecopaginationhelpers

Swift-DocC Version Information

5.8.0

Swift Compiler Version Information

Swift version 5.8 (swift-5.8-RELEASE)
Target: x86_64-unknown-linux-gnu

[stevapple]

Oh it seems to be fixed by #541!