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[YouTube] Avoid crash in author extraction
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@ -448,7 +448,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
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extract_attributes(self._search_regex(
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r'''(?s)(<link\b[^>]+\bitemprop\s*=\s*("|')%s\2[^>]*>)'''
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% re.escape(var_name),
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get_element_by_attribute('itemprop', 'author', webpage) or '',
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get_element_by_attribute('itemprop', 'author', webpage or '') or '',
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'author link', default='')),
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paths[var_name][0])
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