Fix crash in event tab filtering when ability name is unknown
Fix crash in event tab filtering when ability name is unknown

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