#328 Make null renderers easier to detect

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nobody
None
5
2012-11-27
2007-04-24
Nick Guenther
No

XYPlot (and presumably the other plots?) just silently fail if they have no renderer assigned. In creating a lot of charts myself (i.e. not using the factory methods) I'm finding I'm forgetting to do this fairly often, and then am left scratching my head for hours while I search for why my graph is completely empty.

It would be nice if it threw an exception if no renderer is assigned.

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