BibFormat: fix preview record using tpl

* Adresses problem with formating record using Jinja2 template from
  MARCXML without record id.

Signed-off-by: Raquel Jimenez Encinar <raquel.jimenez.encinar@cern.ch>
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
installation: release control fix

* Informs super admins if newer version of Invenio is released.

* Adds new manager command `check-for-software-updates`.

Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>