A chart with no datapoints breaks when trying to render a trend line

[VoxSecundus]

If I render a chart where all of its datasets are empty, or if I empty the dataset of a chart already rendered, the chart will bork and no longer allow itself to be modified. This only occurs when trendlineLinear is included in the options. The browser console spits out:

Uncaught TypeError: t.data[0] is undefined

It would be nice if, on such an occasion, the trendline simply didn't render.