Fix row assigned height when it's not 'auto'
Fix row assigned height when it's not 'auto'

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