Deleting Oauth application via api with nonexistent id causes internal server error

[matusf]

• Gitea version (or commit ref): Gitea version 1.13.7 built with GNU Make 4.1, go1.15.11 : bindata, sqlite, sqlite_unlock_notify
• Git version: git version 2.17.
• Operating system: Ubuntu 18.04
• Downloaded gitea from downloads page
• Running as a command-line program
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
• Log gist:

Completed DELETE /api/v1/user/applications/oauth2/x 500 Internal Server Error in 35.488257ms

Description

Make a DELETE request on /user/applications/oauth2/{id} endpoint with supplied authorization token and invalid id in path. Then 500 response is returned with following response body:

curl -X DELETE 'http://localhost:2999/api/v1/user/applications/oauth2/x' -H "Authorization: token $TOKEN"
{"message":"","url":"http://localhost:3000/api/swagger"}

The url in the body has a different port too.