[Sha 256] Blame does not work when object format sha256

The ability to see blame information for a file is not working when the object type of a repository is set to SHA256.

Where in the application are you seeing this issue?

URL of the page:

• (API) http://gdk.test:3000/api/v4/projects/:id/repository/files/:file_path/blame?ref=head
• (UI) hhttp://gdk.test:3000/root/sha256blame/-/blame/main/README.md?ref_type=heads

How did you expect the application to behave?

• I would expect to see a blame of the file

How did the application behave?

The API returns an empty array [] instead of an expected array of {commit: {}, lines []} The UI returns an empty UI, but no obvious error is presented.