Incorrect API response for repositories without avatar

[jpraet]

Description

For repositories without an avatar, we now get this in the API response:

"avatar_url": "https://demo.gitea.com/"

In 1.21 this was "avatar_url": ""

Gitea Version

1.23.0+dev-151-gc93cbc991e

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

docker

Database

PostgreSQL

[jpraet]

Regression from #30885 maybe?

[jpraet]

Still broken in recently released 1.22.1, missing backport?

[jpraet]

Backported