You are right. The documentation should be changed.

It is a bugfix as part of a bigger change. Most source nodes/datasets forward an empty dataset, when training or testing data is not available. In the time series part especially in the streaming mode this is handling was inconsistant. As a result especially this node was not working when having training **and** testing data.

The code was exhaustively tested for this new use case by Marc and furthermore we run several tests concerning the old setting which made much more problems due to the inconsistancies but works now, too.