Bug 317267 [Automation][Regression]Error is thrown out when preview gantt type chart
chart/org.eclipse.birt.chart.engine.extension/src/org/eclipse/birt/chart/extension/datafeed/GanttDataSetProcessorImpl.java
if ( sDataSetRepresentation == null )
		{
			return ds;
		}
		
		if ( ds == null )
		{
			ds = GanttDataSetImpl.create( null );
		}
		StringTokenizer strTokDataElement = new StringTokenizer( sDataSetRepresentation,
				"," ); 
		StringTokenizer strTokComponents = null;
		String strDataElement = null;
		String strComponent = null;
		Vector vData = new Vector( );
		SimpleDateFormat sdf = new SimpleDateFormat( "MM/dd/yyyy", ULocale.getDefault( ) ); 
		int i = 1;
		while ( strTokDataElement.hasMoreTokens( ) )
		{
			strDataElement = strTokDataElement.nextToken( ).trim( );
			
			strTokComponents = new StringTokenizer( strDataElement );
			
			if ( strTokComponents.countTokens( ) == 1 )
			{
				Date startElement = null;
				try
				{
					startElement = sdf.parse( strDataElement );
				}