Add metadata for control sources, too

src/calng/ShmemToZMQ.py

@@ -112,7 +112,6 @@ class ShmemToZMQ(PipeToZeroMQ.PipeToZeroMQ):
                 new_meta[source] = conversion.meta_to_dict(metadata)
                 new_meta[source]["source"] = source
             data.erase("unstacked")
-
         # forward data to all connected ZMQ sockets
         self._send(new_data, new_meta)