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Command cannot be empty
java.lang.IllegalArgumentException: json can not be null or empty	at org.apache.commons.lang.Validate.notEmpty(Validate.java:363)	at com.jayway.jsonpath.JsonPath.read(JsonPath.java:304)	at org.openremote.controller.protocol.http.HttpGetCommand.run(HttpGetCommand.java:282)	at java.lang.Thread.run(Thread.java:701)