legends.py: fix unicode bug reported by Philippe Makowskic
legends.py: fix unicode bug reported by Philippe Makowskic

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