Dear Matt,
Thank you very much! That worked quite well. I'm recording some details
below for future reference.
In fact, nbconvert raised an error complaining that "metadata" was missing
(from the content), so adding a "metadata: {}" to the content dict of the
display_data message seems to resolve the issue.
It looks like JupyterLab just swallows that error (it should probably log
it). Somehow, JupyNotebook doesn't seem bothered so it probably uses a
different message parser.
By adding a `print(msg)` line to line 359 of
nbconvert/preprocesors/execute.py it was easy to confirm what the message
content was that caused the problem.
Further differences: the IPython.display.HTML(...) results in a
"execute_result" message; not a "display_data" message. I'd be happy
returning one of those instead, but when I read the jupyter kernel protocol
docs, I did find display_data and not execute_result. It may be a later
addition?
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