pdfdoc.py: minor changes to bring into line with TBlatter's early serializer version
pdfdoc.py: minor changes to bring into line with TBlatter's early serializer version

kanarelo/reportlab,kanarelo/reportlab,kanarelo/reportlab,Distrotech/reportlab,Distrotech/reportlab,kanarelo/reportlab,Distrotech/reportlab,kanarelo/reportlab,Distrotech/reportlab,Distrotech/reportlab