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Handle og props with not content
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@ -252,6 +252,7 @@ class PreviewUrlResource(Resource):
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og = {}
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for tag in tree.xpath("//*/meta[starts-with(@property, 'og:')]"):
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if 'content' in tag.attrib:
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og[tag.attrib['property']] = tag.attrib['content']
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# TODO: grab article: meta tags too, e.g.:
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