Only objectify address data if present

i.e. don't try to "remove" an address if no fields are present in form

tailbone/views/master.py

@@ -2752,7 +2752,7 @@ class MasterView(View):
             else:
                 contact.add_mailing_address(**addr)
 
-        elif contact.addresses:
+        elif any([field in data for field in address_fields]) and contact.addresses:
             contact.addresses.pop()
 
         return contact