Problems (NullPointer or ArrayIndex) if no data available for barchart

hi all

we are generating clusteredbarcharts based on the result of some database selects, so the data to display is not static.
we have a problem if there is no data. I have tried different ways to tweak this issue, but always ran into troubles:

I'm using jcharts 0.7.4 (the posted methods are the same in 0.7.5) 

- legendlabels and data array (double[][]) are null 

java.lang.NullPointerException
	at org.jCharts.chartData.AxisChartDataSet.getNumberOfDataSets(AxisChartDataSet.java:136)
	at org.jCharts.chartData.AxisDataSeries.addIAxisPlotDataSet(AxisDataSeries.java:166)

code which throws exception [AxisChartDataSet.getNumberOfDataSets]:
	public final int getNumberOfDataSets()
	{
		return this.data.length;
	}

- legenlabels is null, data array is new double[0][0];

java.lang.ArrayIndexOutOfBoundsException: 0
	at org.jCharts.chartData.DataSet.getNumberOfDataItems(DataSet.java:148)
	at org.jCharts.chartData.AxisDataSeries.addIAxisPlotDataSet(AxisDataSeries.java:168)

code which throws exception [DataSet.getNumberOfDataItems]:
	public int getNumberOfDataItems()
	{
		return this.data[ 0 ].length;
	}

is there any reason, why null and/or length is not checked in those methods ?? 

is there any other way to get a empty chart, I do set 
setUserDefinedScale(0, 2)
setNumItems(5)


regards

tamer


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