Display an error message when LFS object is missing
This is a follow up issue from the [comment](https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/4903#note_2422439880+) Currently, if an LFS object is missing in a merge request, the content is not displayed for security reasons. However, nothing is shown at all — it would be better to display a proper error message, as suggested here: ![Screenshot_2025-04-01_at_11.06.03_pm](/uploads/4a37869063a9100164b5dfc0fcb1f4a8/Screenshot_2025-04-01_at_11.06.03_pm.png)
issue