Some projects exist only in the simple API.

[domdfcoding]

Describe the bug
Some projects are listed at https://pypi.org/simple/, and have a page at https://pypi.org/simple/<project>/, but don't exist in the web UI or the JSON API (https://pypi.org/project/<project>/ and https://pypi.org/pypi/<project>/json).

Some names which exhibit this behaviour are abcmodel, abstractdomain and access-control-python3-v1.

Are these reserved/blocked names, perhaps because they were typosquats or malware?

Expected behavior
All projects listed at /simple/ exist in the JSON API etc.

To Reproduce

• https://pypi.org/project/abcmodel/
• https://pypi.org/pypi/abcmodel/json

My Platform
N/A

Additional context

[di]

This is expected. These are projects that exist and once had releases, but these releases were deleted by the maintainers. Because the JSON and project detail pages display individual releases, there's nothing to show for a project with no releases.

Essentially a duplicate of #1388.