fix: GetFactorLevel() causes a crash, if the there is no valid condition (yet)

Altough the method was designed for returning an invalid/absent factore level

Source/StudyFrameworkPlugin/Private/SFGameInstance.cpp

@@ -762,7 +762,9 @@ FString USFGameInstance::GetFactorLevel(FString FactorName) const
 	{
 		return "ParticipantNotSet";
 	}
-	if (Participant->GetCurrentCondition()->FactorLevels.Contains(FactorName))
+	
+	const auto* Condition = Participant->GetCurrentCondition();
+	if (Condition != nullptr && Condition->FactorLevels.Contains(FactorName))
 	{
 		return Participant->GetCurrentCondition()->FactorLevels[FactorName];
 	}