Well, failed sliently? Again, I run the same bot in cs.wiki and this is what I can see in logs.
Of course Pywikibot didn't report it by email, because it will be unexpectable (and, to be precise, Pywikibot do not always have a way to email you - for example, my Pywikibot bot password don't allow emailing (well, maybe it does, I'm not sure, but it isn't required to allow it).