Bug 135778 There is an error when the data item has no binding data set
Data item can have no binding data set, if it happens, it indicates it only use the basic Java Script function such as new Date(). At this moment, the data of data item is not stored in report document by DtE, which only supports these data items which has binding data set.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/executor/transform/CachedResultSet.java
}
				meta = new ResultClass(projectedColumns);
			}
		}
		return meta;
	}
	/**
	 * Returns all rows in the current group at the specified group level, as an
	 * array of ResultObject objects.
	 * 
	 * @param groupLevel
	 * @return int[], group star index and end index
	 * @throws DataException
	 */
	private int[] getCurrentGroupInfo( int groupLevel ) throws DataException
	{
		return this.resultSetPopulator.getGroupProcessorManager( )
				.getGroupCalculationUtil( )
				.getGroupInformationUtil( )
				.getCurrentGroupInfo( groupLevel );
	}
	/**
	 * @param resultClassStream
	 * @param resultSetStream
	 * @param groupInfoStream
	 * @param isSubQuery
	 * @throws DataException
	 */
	public void doSave( OutputStream resultClassStream,
			OutputStream dataSetDataStream, OutputStream groupInfoStream,