Bug 135465 [smoke]An error occurred when new a casading Parameter
Description: An error occurred when new a casading Parameter Step to reproduce: 1.new a sample db data source and data set 2.New a cascading parameter group, named "gp1", 3.select the data set, then create two cascading parameters, one is row["customernumber"], named p1; the other is row["customername"] Actual result; error message occurred repeatly
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
}
		String value = name;
		DataSetHandle dataSet = null;
		if ( value != null )
		{
			dataSet = SessionHandleAdapter.getInstance( )
					.getReportDesignHandle( )
					.findDataSet( value );
		}
		return dataSet;
	}
	private String[] getDataSetColumns( )
	{
		return getDataSetColumns( null );
	}
	private String[] getDataSetColumns( ScalarParameterHandle handle )
	{
		if ( dataSet == null )
		{
			return new String[0];
		}
		DataSetItemModel[] models = DataSetManager.getCurrentInstance( )
				.getColumns( dataSet, false );
		if ( models == null )
		{
			return new String[0];
		}
		ArrayList valueList = new ArrayList( models.length );
		for ( int i = 0; i < models.length; i++ )
		{