Fix yaml test (#27297) (#27303)

Backport #27297 by @lunny

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

models/fixture_generation.go

@@ -40,7 +40,9 @@ func GetYamlFixturesAccess() (string, error) {
 		fmt.Fprintf(&b, "  user_id: %d\n", a.UserID)
 		fmt.Fprintf(&b, "  repo_id: %d\n", a.RepoID)
 		fmt.Fprintf(&b, "  mode: %d\n", a.Mode)
-		fmt.Fprintf(&b, "\n")
+		if i < len(accesses)-1 {
+			fmt.Fprintf(&b, "\n")
+		}
 	}
 
 	return b.String(), nil