fix: Allow empty array for ListResponse Resources when totalResults is non-zero (#133)

Author: NaqGuug

scim2_models/messages/list_response.py

@@ -60,7 +60,7 @@ def check_results_number(
                 "Field 'total_results' is required but value is missing or null",
             )
 
-        if obj.total_results > 0 and not obj.resources:
+        if obj.total_results > 0 and obj.resources is None:
             raise PydanticCustomError(
                 "no_resource_error",
                 "Field 'resources' is missing or null but 'total_results' is non-zero.",

tests/test_list_response.py

@@ -186,10 +186,7 @@ def test_zero_results():
     ListResponse[User].model_validate(payload, scim_ctx=Context.RESOURCE_QUERY_RESPONSE)
 
     payload = {"totalResults": 1, "Resources": []}
-    with pytest.raises(ValidationError):
-        ListResponse[User].model_validate(
-            payload, scim_ctx=Context.RESOURCE_QUERY_RESPONSE
-        )
+    ListResponse[User].model_validate(payload, scim_ctx=Context.RESOURCE_QUERY_RESPONSE)
 
     payload = {"totalResults": 1}
     with pytest.raises(ValidationError):