If no currentFrame, it means we are in headless case

Change-Id: I840a9085417451fa1d4c0bd8311408357a8f60e9
Reviewed-on: https://gerrit.libreoffice.org/20268Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
(cherry picked from commit 8f7fe77b)
Reviewed-on: https://gerrit.libreoffice.org/20322Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>