Rename exception according to PEP8.

partner_firstname/exceptions.py

@@ -19,7 +19,7 @@
 from openerp import _, exceptions
 
 
-class EmptyNames(exceptions.ValidationError):
+class EmptyNamesError(exceptions.ValidationError):
     def __init__(self, record, value=_("No name is set.")):
         self.record = record
         self._value = value

partner_firstname/models.py

@@ -74,7 +74,7 @@ class ResPartner(models.Model):
     def _check_name(self):
         """Ensure at least one name is set."""
         if not (self.firstname or self.lastname):
-            raise exceptions.EmptyNames(self)
+            raise exceptions.EmptyNamesError(self)
 
     @api.model
     def _firstname_install(self):

partner_firstname/tests/test_partner_firstname.py

@@ -90,7 +90,7 @@ class PartnerFirstnameCase(TransactionCase):
 
     def test_no_names(self):
         """Test that you cannot set a partner without names."""
-        with self.assertRaises(ex.EmptyNames):
+        with self.assertRaises(ex.EmptyNamesError):
             self.original.firstname = self.original.lastname = False