The null means a server side bug prevents the pull request from being
retrieved.
Closes https://codeberg.org/forgejo/forgejo/issues/6571
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7762
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>