correct err usage if err is nil #408
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get https://github.com/yokofly/sling-cli/blob/b8a5a17c4cae2ad54f99b0569ec1560a9c02933b/core/sling/task_run_write.go
and find there are 5 lins with direct Error("msg") instead Error(err, "msg") usage.
say those lines probably hit Err is nil case, and we shall not use Error(err, "msg") if err is nil
follow up #399