Oxyplot xaxis exception

Hi!  I'm new to Oxyplot, but I'm trying to understand why this exception happens.  There are a few different ways of triggering it, as documented in http://discussion.oxyplot.org/topics/226-oxyplot-paint-exception-xaxis-not-defined/ and elsewhere.  There are numerous ways to trigger it, but it seems they center around removing some element and redrawing before everything is quite ready.  In my case, I was changing a series dynamically, and the simplest way was to clear the Plot.Series collection, start with a new LineSeries, build it, and then add it to the collection.  This throws the exception until I scale or zoom.  On the other hand, if I clear the series itself (I know I only have the one series in this plot, so no issue there) and then add the points, voila- I get no exception.  

void ThrowsException(){

            littlePlot.Series.Clear();

            LineSeries littleSeries = new LineSeries();

            //Add Points here

           littlePlot.Series.Add(littleSeries);

           littlePlotView.Refresh();//Throws Exception

}

void WorksFine(){

            LineSeries littleSeries = littlePlot.Series[0] as LineSeries;
            littleSeries.Points.Clear();

            //Add Points here

            littlePlotView.Refresh();//Draws properly!

}

Is this a bug?  Or is this intended?  I can see arguments for both.

Thanks!