code: private void addStatsOfNoDataIncludedMaps(Map statsPerMap) {
          ProxyService proxyService = nodeEngine.getProxyService();
          Collection<String> mapNames = proxyService.getDistributedObjectNames(SERVICE_NAME);
          for (String mapName : mapNames) {
              if (!statsPerMap.containsKey(mapName)) {
                  statsPerMap.put(mapName, EMPTY_LOCAL_MAP_STATS);
              }
          }
      }
docs: Some maps may have a proxy but no data has been put yet. Think of one created a proxy but not put any data in it.
  By calling this method we are returning an empty stats object for those maps. This is helpful to monitor those kind
  of maps.