Handling of null data

[SimonPlatten]

I am using a Timeseries graph displaying data that is written to the graph using AJAX responses.

Unfortunately it would appear that null data is not always handled correctly, the initial view of the graph (detail and summary) shows joins between points spanning null's.

I have tried using the skipPreprocess flag but it would appear that in order for this to be of use the data must be translated into the flotr-format, with it enabled our graph shows no traces.