Bug 191637 Empty cube causes error
Comment removed as requested by the submitter - 2007-06-08 droy
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/util/DiskIndex.java
closeWriteDocumentObject( );
		openReadDocumentObject( );
	}
	
	/**
	 * 
	 * @throws IOException
	 */
	private void closeWriteDocumentObject( ) throws IOException
	{
		if ( documentObject != null )
		{
			documentObject.close( );
			documentObject = null;
		}
		if ( offsetDocumentObject != null )
		{
			offsetDocumentObject.close( );
			offsetDocumentObject = null;
		}
	}
	
	/**
	 * 
	 * @throws IOException
	 */
	private void openReadDocumentObject( ) throws IOException
	{
		if ( documentObject == null )
		{