Fix bug when making context for mailing address

sometimes those belong to a non-person, e.g. customer

tailbone/views/people.py

@@ -515,8 +515,7 @@ class PersonView(MasterView):
         return context
 
     def get_context_address(self, address):
-        person = address.person
-        return {
+        context = {
             'uuid': address.uuid,
             'street': address.street,
             'street2': address.street2,
@@ -524,9 +523,15 @@ class PersonView(MasterView):
             'state': address.state,
             'zipcode': address.zipcode,
             'display': six.text_type(address),
-            'invalid': self.handler.address_is_invalid(person, address),
         }
 
+        model = self.model
+        if isinstance(address, model.PersonMailingAddress):
+            person = address.person
+            context['invalid'] = self.handler.address_is_invalid(person, address)
+
+        return context
+
     def get_context_customers(self, person):
         data = []
         for cp in person._customers: