[youtube] Set the thumbnail to None if it can't be extracted
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@ -1360,7 +1360,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
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video_thumbnail = m_thumb.group(1)
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elif 'thumbnail_url' not in video_info:
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self._downloader.report_warning(u'unable to extract video thumbnail')
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video_thumbnail = ''
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video_thumbnail = None
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else: # don't panic if we can't find it
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video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
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