Bug 211773 Legend entries overlap
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/LegendBuilder.java
return null;
			}
			
			sdBase = (SeriesDefinition) axPrimaryBase.getSeriesDefinitions( )
					.get( 0 );
		}
		else if ( cm instanceof ChartWithoutAxes )
		{
			if ( ( (ChartWithoutAxes) cm ).getSeriesDefinitions( ).isEmpty( ) )
			{
				return null;
			}
			
			sdBase = (SeriesDefinition) ( (ChartWithoutAxes) cm ).getSeriesDefinitions( )
					.get( 0 );
		}
		
		Series seBase = (Series) sdBase.getRunTimeSeries( ).get( 0 );
		DataSetIterator dsiBase = createDataSetIterator( seBase, cm );
		FormatSpecifier fs = null;
		if ( sdBase != null )
		{
			fs = sdBase.getFormatSpecifier( );
		}
		int pos = -1;
		while ( dsiBase.hasNext( ) )
		{
			Object obj = dsiBase.next( );