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
throw new DataException( ResourceConstants.OLAPFILE_DATA_ERROR,
					name );
		}
		if ( !isBetween( currentNode, key ) )
		{
			return null;
		}
		boolean find;
		for ( int i = 0; i < numberOfLevel - 1; i++ )
		{
			find = false;
			documentObject.seek( currentNode.offset );
			for ( int j = 0; j < currentNode.numberOfSon; j++ )
			{
				tempNode = readNonLeafNode( );
				if ( isBetween( tempNode, key ) )
				{
					find = true;
					break;
				}
			}
			if ( !find )
			{
				return null;
			}
			currentNode = tempNode;
		}
		
		documentObject.seek( currentNode.offset );
		for ( int i = 0; i < currentNode.numberOfSon; i++ )