Make a shell job ignore any return codes indicating failure

Current Situation

If you want that an order doesn't stop regardless of what return code a shell job terminates with, the job must be embedded in a try/catch instruction.

Desired Behavior

A shell job itself has a setting whereby the order ignores the return code of the job and thus is not stopped.
At its return code setting a radio button "Ignore" is added besides "On Success" and "On Failure".
If this button is checked then the JSON

                "returnCodeMeaning": {
                    "failure": "none"
                }

will be generated.