Fix crash in case no network plugin was found. BUG: 201995
Fix crash in case no network plugin was found.
BUG: 201995

svn path=/trunk/KDE/kdeedu/marble/; revision=1005467

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