Added quick fix for header files breaking GenerateTestStudyRuns....

Added quick fix for header files breaking GenerateTestStudyRuns. GenerateTestStudyRuns still does not work because of EyeTracking but if this is changed in the future, it should work with the Header writing as well. Possibly later: proper fix by moving WriteHeaderRows call somewhere else.

Source/StudyFrameworkPlugin/Private/SFParticipant.cpp

@@ -35,8 +35,15 @@ bool USFParticipant::Initialize(int Participant)
 			"GazeTracking" + Filename, false);
 	}
 	StartTime = FPlatformTime::Seconds();
+	if (USFGameInstance::Get())
+	{
 		USFGameInstance::Get()->GetLogObject()->WritePositionLogHeaderRow();
 		USFGameInstance::Get()->GetLogObject()->WriteGazeTrackingLogHeaderRow();
+	}
+	else
+	{
+		FSFLoggingUtils::Log("GameInstance not set up yet, no header rows are written to participant logs.");
+	}
 	return true;
 }