DATAREDIS-188 - Infinite loop renaming a non-existent Collection when using Lettuce.

We run into an infinite loop in org.springframework.data.redis.support.collections.CollectionUtils.rename(K, K, RedisOperations<K, ?>) if no value was associated with the key which leads to operations.hasKey(...) always returning false which prevents the actual renaming. Populating the key with "appropriate" dummy values prevents an infinite loop from happening.