Bug 161222 Decoration label should be optional in Gantt Chart
It should not be mandatory to specify a decoration label for Gantt Charts, this can be left blank. Currently the UI and Engine enforce a data definition to be specified for it.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/internal/datafeed/ResultSetWrapper.java
}
			for ( int i = 0; i < trashList.size( ); i++ )
			{
				resultSet.remove( ( (Integer) trashList.get( i ) ).intValue( )
						- i );
			}
			int groupChange = trashList.size( );
			trashList.clear( );
			
			if ( iaBreaks.length > 0 && groupChange > 0 )
			{
				for ( int j = k; j < iaBreaks.length; j++ )
				{
					iaBreaks[j] -= groupChange;
				}
			}
			iStartIndex = iEndIndex - groupChange;
			totalRowCount -= groupChange;
		}
	}
	/**
	 * Returns a pre-computed group count associated with the resultset wrapper
	 * instance
	 * 
	 * @return A pre-computed group count associated with the resultset wrapper
	 *         instance
	 */
	public int getGroupCount( )
	{
		return iaGroupBreaks.length + 1;