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@@ -40,7 +40,7 @@ class Client(object):
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self._access_key_id = aws_access_key_id
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self._secret_access_key = aws_secret_access_key
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self._security_token = aws_security_token
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- self._region = region.lower()
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+ self._region = region.lower() if region is not None else None
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self._timeout = timeout
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self._host = host
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self._proxy_address = proxy_address
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