Post attributed to non-existent collection

[silverpill]

Describe the bug

I was wondering if https://blog.writefreely.org is federated.

The corresponding object ID is https://blog.writefreely.org/api/posts/5tazkaq6om2oq3in, and it can be fetched and the object structure seems to be correct. However, its attributedTo field points to https://blog.writefreely.org/api/collections/writefreely which returns 404. Is this intentional?

Steps to reproduce (if necessary)

Steps to reproduce the behavior:

curl -H "Accept: application/activity+json" https://blog.writefreely.org/api/collections/writefreely

Expected behavior

I expect the value of attributedTo to be an actor.