Fix issue where error replies are not counted on stats (#8659)
lookupKeyReadOrReply and lookupKeyWriteOrReply might decide to reply to the user with the given robj reply. This reply might be an error reply and if so addReply function is used instead of addReplyErrorObject which will cause the error reply not to be counted on stats. The fix checks the first char in the reply and if its '-' (error) it uses addReplyErrorObject.
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