pdfmetrics.py: fix minor buglet discovered by Ron Peleg
pdfmetrics.py: fix minor buglet discovered by Ron Peleg

makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile,makinacorpus/reportlab-ecomobile