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In ssl.py:
 def _load_windows_store_certs(self, storename, purpose):
 certs = bytearray()
 for cert, encoding, trust in enum_certificates(storename):
 # CA certs are never PKCS#7 encoded 
 if encoding == "x509_asn":
 if trust is True or purpose.oid in trust:
 certs.extend(cert)
 self.load_verify_locations(cadata=certs)
 return certs
The line right before the return statement will raise an exception if certs is empty.
It should be protected with "if certs:" as it is elsewhere in this file.