Correçao do erro gerado na mudança de versao 1.0.37

File "/usr/local/lib/python3.5/dist-packages/PyTrustNFe3-1.0.37-py3.5.egg/pytrustnfe/nfe/templates/NfeAutorizacao.xml", line 262, in top-level template code
    <xPed>{{ NFe.infNFe.compra.xPed }}</xPed>
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 408, in getattr
    return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'dict object' has no attribute 'compra'

pytrustnfe/nfe/templates/NfeAutorizacao.xml

@@ -259,7 +259,9 @@
                     </detExport>
                     {% endfor %}
                     {% endif %}
+                    {% if NFe.infNFe.compra is defined %}
                     <xPed>{{ NFe.infNFe.compra.xPed }}</xPed>
+                    {% endif %}
                     <nItemPed>{{ prod.nItemPed }}</nItemPed>
                     <nFCI>{{ prod.nFCI }}</nFCI>
                     {% for rastro in prod.rastro %}