Merge remote-tracking branch 'origin/develop'

* origin/develop:
  case 2069 - Virtual field instead of blackhole.
  case 2257 - Hot fix for a fatal error.
  case 2368 - Ignore availability table for tidsskrift item type page.
Release: v1.9.6
Merge branch 'master' into develop

* master:
  Release: v1.9.6