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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| .. | ||
| ical_events | ||
| migrations | ||
| models | ||
| tasks | ||
| tests | ||
| __init__.py | ||
| admin.py | ||
| constants.py | ||
| ical_utils.py | ||
| quality_score.py | ||