Fix bug in CouchbaseMapCacheClient.java which prevents new Couchbase Object from being created

@Override
 public <K, V> boolean replace(AtomicCacheEntry<K, V, Long> entry, Serializer<K> keySerializer, Serializer<V> valueSerializer) throws IOException {
 final Long revision = entry.getRevision().orElse(0L);
 final String docId = toDocumentId(entry.getKey(), keySerializer);
 final Document doc = toDocument(docId, entry.getValue(), valueSerializer, revision);
 try {
 if (revision < 0) {
 // If the document does not exist yet, try to create one.
 try {
 bucket.insert(doc);
 return true;
 } catch (DocumentAlreadyExistsException e) {
 return false;
 }

final Long revision = entry.getRevision().orElse(0L);

final Long revision = entry.getRevision().orElse(-1L);

if (revision < 0) {
 // If the document does not exist yet, try to create one.
 try {
 bucket.insert(doc);
 return true;
 } catch (DocumentAlreadyExistsException e) {
 return false;
 }