Retrieve children elements from SQLite cache in list_element_children

Depends on !67 (merged)

Closes #42 (closed)

arkindex_worker/worker.py

@@ -845,7 +845,7 @@ class ElementsWorker(BaseWorker):
             ), "worker_version should be of type str"
             query_params["worker_version"] = worker_version
 
-        if self.use_cache:
+        if self.cache:
             # Checking that we only received query_params handled by the cache
             assert set(query_params.keys()) <= {
                 "name",