PING (in IdentifyEndpoint) does not need a database

StackExchange.Redis.Tests/Issues/Issue118.cs

+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StackExchange.Redis.Tests.Issues
+{
+    class Issue118
+    {
+    }
+}

StackExchange.Redis/StackExchange/Redis/RedisDatabase.cs

@@ -345,13 +345,13 @@ public Task HyperLogLogMergeAsync(RedisKey destination, RedisKey[] sourceKeys, C
 
         public EndPoint IdentifyEndpoint(RedisKey key = default(RedisKey), CommandFlags flags = CommandFlags.None)
         {
-            var msg = key.IsNull ? Message.Create(Db, flags, RedisCommand.PING) : Message.Create(Db, flags, RedisCommand.EXISTS, key);
+            var msg = key.IsNull ? Message.Create(-1, flags, RedisCommand.PING) : Message.Create(Db, flags, RedisCommand.EXISTS, key);
             return ExecuteSync(msg, ResultProcessor.ConnectionIdentity);
         }
 
         public Task<EndPoint> IdentifyEndpointAsync(RedisKey key = default(RedisKey), CommandFlags flags = CommandFlags.None)
         {
-            var msg = key.IsNull ? Message.Create(Db, flags, RedisCommand.PING) : Message.Create(Db, flags, RedisCommand.EXISTS, key);
+            var msg = key.IsNull ? Message.Create(-1, flags, RedisCommand.PING) : Message.Create(Db, flags, RedisCommand.EXISTS, key);
             return ExecuteAsync(msg, ResultProcessor.ConnectionIdentity);
         }