Fix crash when report has no exported characters property
Fix crash when report has no exported characters property

sMteX/WoWAnalyzer,ronaldpereira/WoWAnalyzer,anom0ly/WoWAnalyzer,yajinni/WoWAnalyzer,ronaldpereira/WoWAnalyzer,yajinni/WoWAnalyzer,sMteX/WoWAnalyzer,FaideWW/WoWAnalyzer,fyruna/WoWAnalyzer,FaideWW/WoWAnalyzer,Juko8/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,yajinni/WoWAnalyzer,anom0ly/WoWAnalyzer,sMteX/WoWAnalyzer,anom0ly/WoWAnalyzer,ronaldpereira/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,yajinni/WoWAnalyzer,Juko8/WoWAnalyzer,Juko8/WoWAnalyzer,fyruna/WoWAnalyzer,anom0ly/WoWAnalyzer,fyruna/WoWAnalyzer,FaideWW/WoWAnalyzer