MRQ - MovieGraphEditorExample.py on_executor_finished_delegate not called in 5.6

From UDN:
We are launching jobs using a modified version of MovieGraphEditorExample.py. In 5.5 everything works fine, but in 5.6 the on_executor_finished_delegate is never getting called when all the jobs are done rendering.

Render a movie graph job similar to [Link Removed] that dynamically disables some of the jobs in the queue (for example, a Sequence with several shots, we disable all shots except the one shot we are rendering in the queue via Python).