JOE should not delete the related job if a node is deleted from tree

Current Situation
If a Jobchain node is deleted over the context menu in the tree, the step in the tree is removed and the job in the job tree is removed. If the changes are saved the removed job will be deleted in the file system folder. The Jobchain node is then in an inconsistant state as it remains in the table view of the jobchain steps/node view.

Desired Behavior
The jobchain node should be removed from the table view of the jobchain steps/nodes view. The job in the job tree should remain untouched.