Merge parents caches into the current task one

Closes #45 (closed)

arkindex_worker/worker.py

@@ -156,7 +156,7 @@ class BaseWorker(object):
         # Merging parents caches (if there are any) in the current task local cache
         task_id = os.environ.get("TASK_ID")
         if self.use_cache and task_id is not None:
-            task = self.api_client.request("RetrieveTaskFromAgent", id=task_id)
+            task = self.request("RetrieveTaskFromAgent", id=task_id)
             merge_parents_cache(
                 task["parents"],
                 self.cache_path,