Fixed ClassCastException error when there are no slaves in sentinel mode (backported)

src/main/java/org/redisson/client/protocol/RedisCommands.java

@@ -266,7 +266,7 @@ public interface RedisCommands {
 
     RedisStrictCommand<List<String>> SENTINEL_GET_MASTER_ADDR_BY_NAME = new RedisStrictCommand<List<String>>("SENTINEL", "GET-MASTER-ADDR-BY-NAME", new StringListReplayDecoder());
     RedisCommand<List<Map<String, String>>> SENTINEL_SLAVES = new RedisCommand<List<Map<String, String>>>("SENTINEL", "SLAVES",
-            new FlatNestedMultiDecoder(new ObjectMapReplayDecoder(), new ListResultReplayDecoder()), ValueType.OBJECT
+            new NestedMultiDecoder(new ObjectMapReplayDecoder(), new ListResultReplayDecoder(), true), ValueType.OBJECT
             );
 
     RedisStrictCommand<Void> CLUSTER_ADDSLOTS = new RedisStrictCommand<Void>("CLUSTER", "ADDSLOTS");