[common] prevent exception when using empty 'user-agent' (#8116)
use '"headers": {"User-Agent": ""}' to send an empty User-Agent header
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@@ -462,7 +462,7 @@ class Extractor():
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headers["Referer"] = self.root + "/"
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headers["Referer"] = self.root + "/"
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custom_ua = self.config("user-agent")
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custom_ua = self.config("user-agent")
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if custom_ua is None or custom_ua == "auto":
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if not custom_ua or custom_ua == "auto":
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pass
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pass
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elif custom_ua == "browser":
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elif custom_ua == "browser":
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headers["User-Agent"] = _browser_useragent(None)
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headers["User-Agent"] = _browser_useragent(None)
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