[fix] error export aux account

controllers/main.py

@@ -203,9 +203,12 @@ class ExportJournalCg(http.Controller):
             return line.debit
 
     def _get_partner_number(self, partner):
+        if partner.member_number:
             number = partner.member_number + '00'
             prefix = 8 - len(number)
             return (prefix * '0') + number
+        else:
+            return ""
 
     def export_cg_csv(self, lines_to_export, filename_):
         fp = StringIO()