Fix the issue that NPE thrown by ClusterServing.jedisPool with Kafka #3380
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Fix the issue that NPE thrown by ClusterServing.jedisPool when queueUsed was configured as kafka
In PreProcessing.scala if there is an error when invoking decodeArrowBase64, it will unconditionally store the NAN value into Redis. ClusterService.jedisPool would not be initialized if queueUsed was set as kafka in config.yaml. Then it will lead to this issue.