fix recursive call when reading a null index
fix recursive call when reading a null index

svn path=/trunk/KDE/kdeedu/marble/; revision=867940

tzapzoor/marble,tucnak/marble,tzapzoor/marble,quannt24/marble,utkuaydin/marble,quannt24/marble,rku/marble,rku/marble,rku/marble,utkuaydin/marble,probonopd/marble,utkuaydin/marble,David-Gil/marble-dev,David-Gil/marble-dev,AndreiDuma/marble,tzapzoor/marble,AndreiDuma/marble,rku/marble,rku/marble,Earthwings/marble,tucnak/marble,tucnak/marble,adraghici/marble,adraghici/marble,quannt24/marble,adraghici/marble,tucnak/marble,David-Gil/marble-dev,tzapzoor/marble,quannt24/marble,tzapzoor/marble,David-Gil/marble-dev,AndreiDuma/marble,adraghici/marble,probonopd/marble,oberluz/marble,oberluz/marble,rku/marble,tucnak/marble,Earthwings/marble,quannt24/marble,David-Gil/marble-dev,oberluz/marble,Earthwings/marble,tzapzoor/marble,probonopd/marble,oberluz/marble,utkuaydin/marble,Earthwings/marble,utkuaydin/marble,quannt24/marble,AndreiDuma/marble,oberluz/marble,tucnak/marble,AndreiDuma/marble,Earthwings/marble,probonopd/marble,probonopd/marble,probonopd/marble,tzapzoor/marble,AndreiDuma/marble,tzapzoor/marble,David-Gil/marble-dev,tucnak/marble,Earthwings/marble,adraghici/marble,oberluz/marble,quannt24/marble,adraghici/marble,utkuaydin/marble,probonopd/marble