import_tampere_casem raises exceptions sometimes

[aapris]

This command
for i in ../static/exports/*2017-10-10.zip; do python manage.py import_tampere_casem $i;done
raises this exception a few times:

Created organization Osaamis- ja elinkeinolautakunta
Importing case...
Import done!
Importing data...
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/site/virtualenv/paatos/lib/python3.5/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "/site/virtualenv/paatos/lib/python3.5/site-packages/django/core/management/__init__.py", line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/site/virtualenv/paatos/lib/python3.5/site-packages/django/core/management/base.py", line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/site/virtualenv/paatos/lib/python3.5/site-packages/django/core/management/base.py", line 345, in execute
    output = self.handle(*args, **options)
  File "/site/paatos-tampere.6aika.fi/www/paatos/decisions/management/commands/import_tampere_casem.py", line 19, in handle
    importer.import_data()
  File "/site/paatos-tampere.6aika.fi/www/paatos/decisions/importer/paatos_scraper.py", line 265, in import_data
    self._handle_organization(current_path + '/index.json')
  File "/site/paatos-tampere.6aika.fi/www/paatos/decisions/importer/paatos_scraper.py", line 205, in _handle_organization
    self._import_organization(json.load(org_file))
  File "/site/paatos-tampere.6aika.fi/www/paatos/decisions/importer/paatos_scraper.py", line 28, in _import_organization
    classification = data['classification'].title()
AttributeError: 'NoneType' object has no attribute 'title'