fix: 🐛 made next_episode_to_air nullable

[RobinHeidenis]

✅ Closes: BUC-67

[linear[bot]]

BUC-67 Ongoing show not addable due to show schema expecting next_episode_to_air to be null but being an object

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
bucketlist	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 16, 2023 10:16pm

[what-the-diff[bot]]

PR Summary

• Updated next_episode_to_air property The next_episode_to_air property can now be nullable, allowing for instances when there's no information about the next episode.