04c42e2796
This should fix task error as seen in logs, trying to parse an empty
string as ical value:
```
Task apps.schedules.tasks.refresh_ical_files.refresh_ical_file[] raised unexpected: ValueError("Found no components where exactly one is required: ''")
```
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|---|---|---|
| .. | ||
| __init__.py | ||
| drop_cached_ical.py | ||
| notify_about_empty_shifts_in_schedule.py | ||
| notify_about_gaps_in_schedule.py | ||
| refresh_ical_files.py | ||