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Importing exams broken due to missing time period

Traceback (most recent call last):
  File "/usr/local/bin/aleksis-admin", line 8, in <module>
    sys.exit(aleksis_cmd())
  File "/usr/local/lib/python3.10/dist-packages/aleksis/core/__main__.py", line 14, in aleksis_cmd
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.10/dist-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.10/dist-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.10/dist-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.10/dist-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.10/dist-packages/aleksis/apps/untis/management/commands/untis_import_mysql.py", line 30, in handle
    command.run(background=background, version=version)
  File "/usr/local/lib/python3.10/dist-packages/aleksis/apps/untis/commands.py", line 46, in run
    _untis_import_mysql(cls.get_terms(), school_id=school_id, version=version)
  File "/usr/local/lib/python3.10/dist-packages/aleksis/apps/untis/util/mysql/main.py", line 99, in untis_import_mysql
    import_exams(validity_range, time_periods_ref, subjects_ref, teachers_ref, rooms_ref)
  File "/usr/local/lib/python3.10/dist-packages/aleksis/apps/untis/util/mysql/importers/exams.py", line 93, in import_exams
    period = time_periods_ref[weekday][period]
KeyError: 0

My best guess is that this happens when an exam is planned for a time period that does not have a regular lesson in the plan.