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
this.resultSetPopulator.first( groupLevel );
	}
	
	/*
	 * Advances row cursor to the last row at the specified group level
	 * 
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#last(int)
	 */
	public void last( int groupLevel ) throws DataException
	{
		this.resultSetPopulator.last( groupLevel );
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#getResultClass()
	 */
	public IResultClass getResultClass( ) throws DataException
	{
		return this.resultSetPopulator.getResultSetMetadata( );
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#getCurrentResultIndex()
	 */
	public int getCurrentResultIndex( ) throws DataException
	{
		checkStarted( );
		return this.resultSetPopulator.getCache( ).getCurrentIndex( );
	}
	/*
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#getCurrentGroupIndex(int)
	 */