Issue with single output being an array

[anomam]

Reference: https://github.com/cedricleroy/pyungo/blob/master/pyungo/core.py#L146-L152

I ran into an issue for a specific type of node. The node returns 1 output that is a list of multiple datetime objects (like a timestamps vector). Because of the lines referenced above, the graph only saves the 1st item of that returned list, because it thinks that multiple outputs will be returned (since iter(res) doesn't fail), but there is only one output_name in the node (like "timestamps" for instance).
Essentially, the for loop goes through the timestamps list, and returns the first element of that list as data to be saved...

[cedricleroy]

Fixed by #7