Multiple JSONs returned when doing DELETE on /v1/user/keys/2 with a non-existing key

[ludovicianul]

Description

While doing some fuzzing using https://github.com/Endava/cats I discovered an issue for the /v1/user/keys/ endpoint. Doing a DELETE with non existing key return 2 JSONs in the same body.

{
    "message": "",
    "url": "https://try.gitea.io/api/swagger"
}
{
    "errors": null,
    "message": "The target couldn't be found.",
    "url": "https://try.gitea.io/api/swagger"
}

You can reproduce the issue using (just replace $token with your own token):

cats replay Test243.json

Or doing a curl at https://try.gitea.io/api/v1/user/keys/2 for example.
Test243.json.zip

Gitea Version

1.17.0+dev-423-g4396d0e7c

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?

Using https://try.gitea.io/.

Database

No response

[wxiaoguang]

Well, a return is lost in code again