@NotNull
  private static Map<String, PropertyValue> getProperties(@NotNull DiffContent content) {
    if (content instanceof EmptyContent) return Collections.emptyMap();

    List<PropertyData> properties = ((SvnPropertiesDiffRequest.PropertyContent)content).getProperties();

    Map<String, PropertyValue> map = new HashMap<>();

    for (PropertyData data : properties) {
      if (map.containsKey(data.getName())) LOG.warn("Duplicated property: " + data.getName());
      map.put(data.getName(), data.getValue());
    }

    return map;
  }
@NotNull
  private static Map<String, PropertyValue> getProperties(@NotNull DiffContent content)