code: public static <K, V> EntryView<K, V> createNullEntryView(K key) {
          return new NullEntryView<>(key);
      }
docs: Creates a null entry view that has only key and no value.
  
  @param key the key object which will be wrapped in {@link com.hazelcast.core.EntryView}.
  @param <K> the type of key.
  @param <V> the type of value.
  @return returns  null entry view.