Don’t ask for organisation type when we know it

Every time someone adds a new service we ask them what kind of
organisation they work for.

We can look this up based on the user’s email address now. So we should
only ask the question if:
- we don’t know about the organisation
- or we haven’t set what type of organisation it is (this shouldn’t be
  possible on productions because we’ve populated the column for all
  existing organisations and it’s impossible to add a new one without
  setting it

tests/app/main/views/test_sign_in.py

@@ -39,7 +39,9 @@ def test_sign_in_explains_other_browser(logged_in_client, api_user_active, mocke
 
 
 def test_doesnt_redirect_to_sign_in_if_no_session_info(
-    client_request, api_user_active
+    client_request,
+    api_user_active,
+    mock_get_organisation_by_domain,
 ):
     assert api_user_active.current_session_id is None