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
{
						Date dateComponent = sdf.parse( strComponent.substring( 1 ) );
						entry.setEnd( new CDateTime( dateComponent ) );
					}
					else
					{
						entry.setLabel( strComponent );
					}
				}
				catch ( ParseException e )
				{
					
				}
			}
			vData.add( entry );
		}
		ds.setValues( vData );
		return ds;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.datafeed.DataSetProcessor#getExpectedStringFormat()
	 */
	public String getExpectedStringFormat( )
	{
		return Messages.getString( "info.gantt.sample.format", 
				getULocale( ) );
	}
	public String toString( Object[] columnData ) throws ChartException