public void shortenIdsIfAvailable(java.util.@Nullable List<CounterUpdate> counters) {
    if (counters == null) {
      return;
    }
    for (CounterUpdate update : counters) {
      cache.shortenIdsIfAvailable(update);
    }
  }
@Test
  public void testNullUpdates() {
    CounterShortIdCache shortIdCache = new CounterShortIdCache();
    shortIdCache.shortenIdsIfAvailable(null);
  }