partner_firstname: Name is not mandatory if partner is an address

partner_firstname/models/partner.py

@@ -146,7 +146,8 @@ class ResPartner(models.Model):
     @api.constrains("firstname", "lastname")
     def _check_name(self):
         """Ensure at least one name is set."""
-        if not (self.firstname or self.lastname):
+        if (self.type == 'contact' or self.company_type == 'company') \
+           and not (self.firstname or self.lastname):
             raise exceptions.EmptyNamesError(self)
 
     @api.one

partner_firstname/tests/test_empty.py

@@ -42,7 +42,7 @@ class CompanyCase(TransactionCase):
 
 class PersonCase(CompanyCase):
     """Test ``res.partner`` when it is a person."""
-    context = {"default_is_company": False}
+    context = {"default_is_company": False, "default_type": 'contact'}
 
 
 class UserCase(CompanyCase, MailInstalled):
@@ -58,3 +58,15 @@ class UserCase(CompanyCase, MailInstalled):
         else:
             # Run tests
             super(UserCase, self).tearDown()
+
+
+class AddressCase(TransactionCase):
+    """Test ``res.partner`` when it is a address."""
+
+    def test_new_empty_address(self):
+        """Create an empty partner."""
+        self.original = self.env["res.partner"].create({
+            "is_company": False,
+            "type": 'invoice',
+            "lastname": "",
+            "firstname": ""})