@Override
    public Object getValueOnDisk(InternalRegion region) throws EntryNotFoundException {
      throw new UnsupportedOperationException(
          String.format("No entry support on regions with DataPolicy %s",
              DataPolicy.EMPTY));
    }
Provides a dummy implementation of RegionEntry so that basicPut can return an instance that
make the upper levels think it did the put.
geode-core/src/main/java/org/apache/geode/internal/cache/ProxyRegionMap.java