Alert templates on pull request comparison page don't work

[TheFox0x7]

Description

Reproduction steps:

1. Create user1 and user2
2. user1 creates a repository "example"
3. user2 forks it and makes some change
4. user1 blocks user2
5. user2 tries to submit PR

Expected outcome:
User2 gets a message that they are blocked from repository.

Actual:
Template fails and displays server error.

---

Analysis:

Parameters passed to the template lack Details key which causes the error.

gitea/routers/web/repo/pull.go

Lines 1355 to 1369 in 079a1ff

	case errors.Is(err, user_model.ErrBlockedUser):
	flashError, err := ctx.RenderToHTML(tplAlertDetails, map[string]any{
	"Message": ctx.Tr("repo.pulls.push_rejected"),
	"Summary": ctx.Tr("repo.pulls.new.blocked_user"),
	})
	if err != nil {
	ctx.ServerError("CompareAndPullRequest.HTMLString", err)
	return
	}
	ctx.JSONError(flashError)
	case errors.Is(err, issues_model.ErrMustCollaborator):
	flashError, err := ctx.RenderToHTML(tplAlertDetails, map[string]any{
	"Message": ctx.Tr("repo.pulls.push_rejected"),
	"Summary": ctx.Tr("repo.pulls.new.must_collaborator"),
	})

Adding it with even an empty string resolves the issue.
I haven't tried to do this on demo instance.

Gitea Version

079a1ff

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

Expected:

Actual:

Git Version

2.47.1

Operating System

Linux

How are you running Gitea?

self-built

Database

SQLite