StatisticVisualizerBase: Fixed missing mandatory index parameter of template property.

Author: levy

src/inet/visualizer/base/StatisticVisualizerBase.cc

@@ -113,6 +113,7 @@ void StatisticVisualizerBase::addResultRecorder(cComponent *source, simsignal_t
     auto recordingMode = getRecordingMode();
     statisticTemplateProperty.addKey("record");
     statisticTemplateProperty.setValue("record", 0, recordingMode.c_str());
+    statisticTemplateProperty.setIndex("visualizer");
     statisticBuilder.addResultRecorders(source, signal, statisticName, &statisticTemplateProperty);
 }