Reply with array of return codes if the key does not exist for HFE commands (#13343)
Currently, HFE commands reply with empty array if the key does not exist. Though, non-existing key and empty key is the same thing. It means fields given in the command do not exist in the empty key. So, replying with an array of 'no field' error codes (-2) suits better to Redis logic. e.g. Similarly, `hmget` returns array of nulls if the key does not exist. After this PR: ``` 127.0.0.1:6379> hpersist missingkey fields 2 a b 1) (integer) -2 2) (integer) -2 ```
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