feat(for_id): Return None for europarl elections.

* There's no clear way to derive Region from Country if the election is in England.

sopn_publish_date/__init__.py

@@ -38,7 +38,7 @@ def for_id(self, election_id: str, country: Country = None) -> date:
         election_type, poll_date = type_and_poll_date(election_id)
 
         def valid_election_type(el_type):
-            return el_type in self.election_id_lookup or el_type in ["local", "parl"]
+            return el_type in self.election_id_lookup or el_type in ["local", "parl", "europarl"]
 
         def requires_country(el_type):
             return el_type not in self.election_id_lookup
@@ -56,6 +56,8 @@ def requires_country(el_type):
             return self.local(poll_date, country=country)
         elif election_type == "parl":
             return self.uk_parliament(poll_date, country=country)
+        elif election_type == "europarl":
+            return None
 
     def northern_ireland_assembly(self, poll_date: date) -> date:
         """

tests/test_sopn_publish_date.py

@@ -32,6 +32,11 @@ def test_publish_date_parl_id_with_country():
     assert publish_date == date(2019, 1, 25)
 
 
+def test_publish_date_europarl_id_with_country():
+    publish_date = sopn_publish_date.for_id("europarl.2019-02-21", country=Country.ENGLAND)
+
+    assert publish_date is None
+
 def test_publish_date_not_an_election_type():
 
     with raises(NoSuchElectionTypeError) as err: