with commit 2970ec84 the check for
a valid pDoc had been removed

Change-Id: I644ee82a46ec4f047f1a1b6bff68c4b67e96c3d8
Reviewed-on: https://gerrit.libreoffice.org/22006Reviewed-by: Oliver Specht <oliver.specht@cib.de>
Tested-by: Oliver Specht <oliver.specht@cib.de>