Update GETTING_STARTED.ipynb

[duncandoo]

Database schema has changed with event_data now all NULL and the actual JSON data object offloaded to a separate table and column event_data.shared_data. https://data.home-assistant.io/docs/events.

These edits fix the error that otherwise occurs at like 82 when json.loads(event.event_data) finds a NULL value of type NoneType.

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