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Mailman 2.1 archive import fails if a nul character is found: A string literal cannot contain NUL (0x00) characters

When importing Mailman 2.1 archive, the import fails if a nul (0x00) character is found.

Failed adding message <857A4D84DE6D1D41837DD9284F2729AB09E20126@srv1.example.ku.dk>: A string literal cannot contain NUL (0x00) characters.
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 305, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 356, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/site-packages/hyperkitty/management/commands/hyperkitty_import.py", line 278, in handle
    importer.from_mbox(mbfile)
  File "/usr/local/lib/python2.7/site-packages/hyperkitty/management/commands/hyperkitty_import.py", line 152, in from_mbox
    add_to_list(self.list_address, message)
  File "/usr/local/lib/python2.7/site-packages/hyperkitty/lib/incoming.py", line 149, in add_to_list
    email.save()
  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 796, in save
    force_update=force_update, update_fields=update_fields)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 824, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 908, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py", line 947, in _do_insert
    using=using, raw=raw)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/query.py", line 1043, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 1054, in execute_sql
    cursor.execute(sql, params)
  File "/usr/local/lib/python2.7/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
ValueError: A string literal cannot contain NUL (0x00) characters.