}).filter(o -> o != null && keySet.add(o.getFirst())).collect(HashMap<String, List<String>>::new,
                        (m, d) -> m.put(d.getFirst(), Arrays.asList(d.getSecond().split(","))), HashMap::putAll));
            }
            propMap.put(DEFAULT_LABEL_VALUES, map);
        }
        return map.entrySet().stream().flatMap(e -> {
            final String key = e.getKey();