Describe the bug
Provide a clear and concise description of what the bug is

Unhandled exception. System.InvalidOperationException: Sequence contains no elements
at System.Linq.ThrowHelper.ThrowNoElementsException()
at System.Linq.Enumerable.Min(IEnumerable`1 source)
at ScottPlot.PlottableScatter.GetLimits()
at ScottPlot.Settings.AxisAuto(Double horizontalMargin, Double verticalMargin, Boolean xExpandOnly, Boolean yExpandOnly, Boolean autoX, Boolean autoY)
at ScottPlot.Plot.RenderBitmap()
at ScottPlot.Plot.GetBitmap(Boolean renderFirst, Boolean lowQuality)
at ScottPlot.WpfPlot.Render(Boolean skipIfCurrentlyRendering, Boolean lowQuality, Boolean recalculateLayout)

To Reproduce
Describe what we can do to reproduce the behavior

// include code to help us reproduce this bug

Screenshots
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