Capture errors from the Exit case

[Thoric]

Reviewing somebody's DQMH code I noticed an error generated in the exit case where they had cleanup code (1) was not captured by the Tester. This is purely because the exit case causes the MHL to terminate (2), so the normal error handling strategy (3) doesn't work (enqueuing another job called Error). Can I propose, unless there's a better technique, that adding the "Error Report" broadcast at the end of the Exit case (4) is a simple way to ensure any errors generated here get reported.

Add Error Broadcast in MHL Exit Case