Bug 204229 [Automation][Regression]Exception is thrown when preview reportdesign in webviewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/RDSave.java
this.rowLenOs.close( );
		}
		catch ( IOException e )
		{
			throw new DataException( ResourceConstants.RD_SAVE_ERROR,
					e,
					"Result Data" );
		}
	}
	
	/**
	 * @throws DataException
	 */
	private void saveForIV( ) throws DataException
	{
		if ( exprNameSet.size( ) == 0 )
		{
			
			exprNameSet = getExprNameSet( );
		}
		
		
		this.rdSaveUtil.saveExprMetadata( exprNameSet );
	
	}
	
	/* 
	 * @see org.eclipse.birt.data.engine.impl.document.IRDSave#saveResultIterator(org.eclipse.birt.data.engine.odi.IResultIterator, int, int[])
	 */
	public void saveResultIterator( IResultIterator odiResult, int groupLevel,