Expect a list of metadata streams

src/AsapoWorker/streamer.py

@@ -50,7 +50,7 @@ def get_new_stream(stream, receiver_stream_list, metadata_stream_list,
 
     receiver_stream_list = sorted(receiver_stream_list, key=lambda x: x['timestampCreated'])
     receiver_stream_list = [x['name'] for x in receiver_stream_list]
-    if isinstance(metadata_stream_list, dict):
+    if isinstance(metadata_stream_list, list):
         metadata_stream_list = [x['name'] for x in metadata_stream_list]
     if 'basename' in naming_scheme:
         if sender_stream_list is None: