fixed case where __unicode__ for object_state does not work because of exclude fields
fixed case where __unicode__ for object_state does not work because of exclude fields

klahnen/django-audit-log,ipsosante/django-audit-log,klahnen/django-audit-log,Atomidata/django-audit-log,Atomidata/django-audit-log,ipsosante/django-audit-log,ipsosante/django-audit-log