JobScheduler should consider that a parameter can have a hex_value attribute

Current Situation

• The JobScheduler stores after each node of a job chain the state of the order in the database in an xml format, particularly the parameters.
• If a parameter is set with special characters then the value of the parameter is stored in a hexadecimal representation and has the attribute hex_value instead of value.
• When the JobScheduler reads this order parameter for the next job chain node then it raises the following error

  COM-80020009 XmlException: com.sos.scheduler.engine.common.scalautil.xmls.ScalaXMLEventReader$UnparsedAttributesException: Unknown XML attributes 'hex_value' - In <sos.spooler.variable_set> (:1:37) <variable> (:1:15796) <variable> (:1:15796), method=call
  

Desired Behavior

The JobScheduler should consider that a parameter can have a hex_value attribute and should not raise an error.