JobScheduler Monitoring Interface should provide the correct node name and error message

Current Situation

• if an error occurs in a different job node of a job chain than the first node then
  • the Monitoring Interface sends information about the first node.
  • the error message is also about the first node, but since the first node did not have any error, the error message is empty.
• see https://sourceforge.net/p/jobscheduler/support-requests/13/

Desired Behavior

• The Monitoring Interface should provide the correct information about the error node for all job nodes.