If not logged in, go home when clicking GOV.UK

It’s a bit of a weird experience to be taken to the sign in screen when
you click GOV.UK in the header. It’s doubly weird if you take the tour
before creating an account, and at the end of the tour you get prompted
to sign in.

This commit adds some extra logic to take you to the homepage instead,
which I think is more what you’d expect.

app/main/views/choose_service.py

@@ -16,8 +16,11 @@ def choose_service():
 
 
 @main.route("/services-or-dashboard")
-@login_required
 def show_all_services_or_dashboard():
+
+    if not current_user.is_authenticated():
+        return redirect(url_for('.index'))
+
     services = service_api_client.get_services({'user_id': current_user.id})['data']
 
     if 1 == len(services):

tests/app/main/views/test_choose_services.py

@@ -59,7 +59,7 @@ def test_should_redirect_if_not_logged_in(app_):
         with app_.test_client() as client:
             response = client.get(url_for('main.show_all_services_or_dashboard'))
             assert response.status_code == 302
-            assert url_for('main.sign_in', _external=True) in response.location
+            assert url_for('main.index', _external=True) in response.location
 
 
 def test_should_show_all_services_for_platform_admin_user(app_,