Check ctx.Written() for GetActionIssue (#25698) (#25711)

Backport #25698 by @wolfogre

Fix #25697.

Just avoid panic, maybe there's another bug to trigger this case.

Co-authored-by: Jason Song <i@wolfogre.com>

routers/web/repo/issue_pin.go

@@ -15,6 +15,9 @@ import (
 // IssuePinOrUnpin pin or unpin a Issue
 func IssuePinOrUnpin(ctx *context.Context) {
 	issue := GetActionIssue(ctx)
+	if ctx.Written() {
+		return
+	}
 
 	// If we don't do this, it will crash when trying to add the pin event to the comment history
 	err := issue.LoadRepo(ctx)