[InterNetNews/inn] 5f3b35: Add storage failure reason of missing newsgroups

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 5f3b35751929968d440b28d74261ca8b3bfa0845
      https://github.com/InterNetNews/inn/commit/5f3b35751929968d440b28d74261ca8b3bfa0845
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-11-02 (Thu, 02 Nov 2023)

  Changed paths:
    M storage/interface.c

  Log Message:
  -----------
  Add storage failure reason of missing newsgroups

The reason of the error of an empty Newsgroups header field was not
set (contrary to all the other reasons).