Repo generated from template fails when template has no webhooks

[gabriel-vasile]

Description

To reproduce in web UI:

1. create a repo and check "Mark repository as template"
2. create another repo using the template in step 1. In "Template Items", check "Webhooks" checkmark.

What I expected: step 2 creates a new, empty repo
What happened: web/repo/repo.go:195:handleCreateError() [E] CreatePost: no element on slice when insert. Pretty cryptic error I would say. grepping project returns no result.

Gitea Version

head main

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?

./gitea web

Database

SQLite

[wxiaoguang]

Wait for backport

[zeripath]

Fixed by #20768