[youtube:playlist] Fix mixes extraction (fixes #3051)
The username seems to be empty now.
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		@@ -1414,11 +1414,9 @@ class YoutubePlaylistIE(YoutubeBaseInfoExtractor):
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        title_span = (search_title('playlist-title') or
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            search_title('title long-title') or search_title('title'))
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        title = clean_html(title_span)
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        video_re = r'''(?x)data-video-username="(.*?)".*?
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        video_re = r'''(?x)data-video-username=".*?".*?
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                       href="/watch\?v=([0-9A-Za-z_-]{11})&[^"]*?list=%s''' % re.escape(playlist_id)
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        matches = orderedSet(re.findall(video_re, webpage, flags=re.DOTALL))
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        # Some of the videos may have been deleted, their username field is empty
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        ids = [video_id for (username, video_id) in matches if username]
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        ids = orderedSet(re.findall(video_re, webpage, flags=re.DOTALL))
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        url_results = self._ids_to_results(ids)
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        return self.playlist_result(url_results, playlist_id, title)
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