Invisible text lines with DokuWiki dw2pdf Plugin

If you encounter empty text lines in PDFs exported from DokuWikis PDF Plugin dw2pdf, here is something that helped me workaround it.

With only Google Chrome showing the PDFs content correct, I tried Evince and Acrobat under Windows. Under Windows I got the feedback, that the font dejavusanscondensed was not found. So as a workaround, I can currently tell you, that the following worked:

dokuwiki/lib/plugins/dw2pdf/mpdf/config_fonts.php:

$this->sans_fonts = array('dejavusanscondensed','dejavusans','freesans',...);

There you have to put helvetica in front of this list, so it is used before dejavusanscondensed.

$this->sans_fonts = array('helvetica','dejavusanscondensed','dejavusans',...);

After this little change, Evince and Acrobat are now able to show the invisible text.