Created Unassigned: LineChart breaks when all values are Zero [28017]

All points will appear above the grid when the series data is all zeros.


```
<ajaxToolkit:LineChart ID="LineChart1" runat="server"
ChartWidth="450" ChartHeight="300" ChartType="Basic"
ChartTitle="United States versus European Widget Production"
CategoriesAxis="2007,2008,2009,2010,2011,2012"
ChartTitleColor="#0E426C" CategoryAxisLineColor="#D08AD9"
ValueAxisLineColor="#D08AD9" BaseLineColor="#A156AB" ValueAxisLines="5">
<Series>
<ajaxToolkit:LineChartSeries Name="United States"
LineColor="#6C1E83" Data="0,0,0,0,0,0" />
</Series>
</ajaxToolkit:LineChart>
```