Bug 211773 Legend entries overlap
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/LegendBuilder.java
throw new ChartException( ChartEnginePlugin.ID,
						ChartException.GENERATION,
						"exception.base.axis.no.series.definitions", 
						Messages.getResourceBundle( xs.getULocale( ) ) );
			}
			
			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( );
			obj = getNonEmptyValue( obj, IConstants.ONE_SPACE );
			
			
			while ( !isValidValue( obj ) && dsiBase.hasNext( ) )
			{
				obj = dsiBase.next( );
			}
			pos++;