Fixes a broken test (test_operation.py)

Thanks to uruwhy:

> Those tests in particular need to manually store the operation fact
> sources in the data service - the data service loads fact sources on
> server startup, so I essentially had to replicate that behavior with
> the dummy fact sources for the unit test

tests/objects/test_operation.py

@@ -427,6 +427,7 @@ def test_without_learning_parser(self, event_loop, app_svc, contact_svc, data_sv
 
     def test_facts(self, event_loop, app_svc, contact_svc, file_svc, data_svc, learning_svc, fire_event_mock,
                    op_with_learning_and_seeded, make_test_link, make_test_result, knowledge_svc):
+        event_loop.run_until_complete(data_svc.store(op_with_learning_and_seeded.source))
         test_link = make_test_link(9876)
         op_with_learning_and_seeded.add_link(test_link)