[publican-list] stop on warnings

[Eugenio Pérez]

Hi There.

I'm trying to integrate publican with travis ci, and I need publican to
return a code different of 0 if it found a warning (in my current case, an
image missing). I've tried with --format test, but I see that it it's only
a subset of pdf/html, and I don't see any related option.

Is there any option to achieve it?

Thanks and regards.
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