... there's no parent style set

Sample:
<?xml version="1.0" encoding="UTF-8"?>
<svg height="600" width="400"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
font-size="100%">
<text x="5" y="15">Sample 1</text>
</svg>

Change-Id: Iec88c148475bf8a610286414083e9801faaf8d78
Reviewed-on: https://gerrit.libreoffice.org/21553Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Armin Le Grand <Armin.Le.Grand@cib.de>