correção QrCode para CNPJ

pynfe/processamento/serializacao.py

@@ -620,7 +620,6 @@ class SerializacaoQrcode(object):
                 cpf = nfe.xpath('ns:infNFe/ns:dest/ns:CNPJ/text()', namespaces=ns)[0]
             except IndexError:
                 cpf = None
-            cpf = None
         total = nfe.xpath('ns:infNFe/ns:total/ns:ICMSTot/ns:vNF/text()', namespaces=ns)[0]
         icms = nfe.xpath('ns:infNFe/ns:total/ns:ICMSTot/ns:vICMS/text()', namespaces=ns)[0]
         digest = nfe.xpath('sig:Signature/sig:SignedInfo/sig:Reference/sig:DigestValue/text()', namespaces=sig)[0].encode()