JOE should not crash when removing a disabled Job Element

Description

1. create a job.
2. Double Click the job and write a command in Script section (ex: hostname)
3. Select Jobs
4. Disable the job
5. Delete the job using Remove Job button
6. Answer YES to : JOE:Question : Do you want to remove the job?

Then JOE crashes with a null pointer exception.
Desired Behaviour
Joe should not crash. The Job Element should be removed.