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
checkStarted( );
		boolean hasNext = this.resultSetPopulator.getCache( ).next( );
		this.resultSetPopulator.getGroupProcessorManager( )
				.getGroupCalculationUtil( )
				.getGroupInformationUtil( )
				.next( hasNext );
		return hasNext;
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#getEndingGroupLevel()
	 */
	public int getEndingGroupLevel( ) throws DataException
	{
		return this.resultSetPopulator.getEndingGroupLevel( );
	}
	/**
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#getStartingGroupLevel()
	 */
	public int getStartingGroupLevel( ) throws DataException
	{
		return this.resultSetPopulator.getStartingGroupLevel( );
	}
	/*
	 * Rewinds row cursor to the first row at the specified group level
	 * 
	 * @see org.eclipse.birt.data.engine.odi.IResultIterator#first(int)
	 */
	public void first( int groupLevel ) throws DataException
	{