Traceback (most recent call last):
  File "/home/ced/Projects/trunk/tryton-env/trytond/trytond/modules/notification_email/tests/test_notification_email.py", line 27, in <lambda>
    self.addCleanup(lambda: config.set('email', 'from', reset_from))
  File "/usr/lib64/python3.6/configparser.py", line 1192, in set
    self._validate_value_types(option=option, value=value)
  File "/usr/lib64/python3.6/configparser.py", line 1177, in _validate_value_types
    raise TypeError("option values must be strings")
TypeError: option values must be strings