Make sure field value is string before serializing (fixes #706)
Make sure field value is string before serializing (fixes #706)

makinacorpus/django-mapentity,Anaethelion/django-mapentity,Anaethelion/django-mapentity,makinacorpus/django-mapentity,Anaethelion/django-mapentity,makinacorpus/django-mapentity