It turns out that the following line does not create any .png files:

  self.presentation.save(in_=thumbnail_folder, as_=appscript.k.save_as_PNG)

Btw, I'm testing a .ppt file if that makes a difference. Did you test only pptx 
files?
-- 
https://code.launchpad.net/~marmyshev/openlp/presentation/+merge/185973
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