Can happen at least when LibreOffice is started from the command line
using the 'open' command line and passed a file name.

Change-Id: I93145974a56e124550579cae8fd69ccb4a7d3bda
Reviewed-on: https://gerrit.libreoffice.org/54758Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>