When an array of EMF+ has extra bytes in the end, that are less than 12,
they should not be  treated as another EMF+ record, but simply ignored.

Change-Id: I34701c00916812c8a6a4b69730f602da81719b35
Reviewed-on: https://gerrit.libreoffice.org/18110Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Andras Timar <andras.timar@collabora.com>
(cherry picked from commit daecb93a)
Reviewed-on: https://gerrit.libreoffice.org/18200Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>