[ticket/12324] Correctly create di container if config/ is missing from update/

PHPBB3-12324
Merge remote-tracking branch 'Elsensee/ticket/12324' into develop-ascraeus

* Elsensee/ticket/12324:
  [ticket/12324] Correctly create di container if config/ is missing from update/
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12324] Correctly create di container if config/ is missing from update/