Code review comment for lp:~tomasgroth/openlp/mupdf

>And 1 more suggestion: may be it is better to use this:
>
>os.path.isfile(os.path.join(self.get_temp_folder(),
>u'mainslide001.png'))
>
>instead of this:
>
>os.path.isfile(self.get_temp_folder() + u'/mainslide001.png')

Good catch Dmitriy!

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