Always include grant card in Plain customer cards response (#4555)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Marco Acierno <marcoacierno@users.noreply.github.com>

Author: marcoacierno

backend/integrations/plain_cards.py

@@ -3,7 +3,11 @@
 
 
 def create_grant_card(request, user, conference):
-    grant = Grant.objects.of_user(user).for_conference(conference).first()
+    grant = (
+        Grant.objects.of_user(user).for_conference(conference).first()
+        if user
+        else None
+    )
 
     if not grant:
         return {"key": "grant", "components": []}

backend/integrations/tests/test_views.py

@@ -70,7 +70,7 @@ def test_cannot_get_plain_customer_cards_when_user_doesnt_exist(rest_api_client)
     )
 
     assert response.status_code == 200
-    assert response.data == {"cards": []}
+    assert response.data == {"cards": [{"key": "grant", "components": []}]}
 
 
 @override_settings(PLAIN_INTEGRATION_TOKEN="secret")

backend/integrations/views.py

@@ -30,9 +30,6 @@ def plain_customer_cards(request):
 
     user = User.objects.filter(email=customer_email).first()
 
-    if not user:
-        return Response({"cards": []})
-
     cards = []
     if "grant" in card_keys:
         cards.append(create_grant_card(request, user, conference))