Bugfix: empty lines caused jump to the top of the page.
Bugfix: empty lines caused jump to the top of the page.

prepare/TestWeasyPrint,andrewleech/WeasyPrint,andrewleech/WeasyPrint,jasco/WeasyPrint,marclaporte/WeasyPrint,Kozea/WeasyPrint,Kozea/WeasyPrint,prepare/TestWeasyPrint,jasco/WeasyPrint,marclaporte/WeasyPrint