fix: return 404 if the project doesn't exist

[thomasheartman]

This change adds a check for whether the project exists in the database before trying to fetch data for it. If it doesn't exist, you'll get a 404.

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Name	Status	Preview	Comments	Updated (UTC)
unleash-monorepo-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 4, 2024 9:35am

1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **unleash-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/unleash-team/unleash-docs/CUfkZbStaLiPsyTT8xv2vCjYT2No)) | [Visit Preview](https://unleash-docs-git-fix-1-2934-return-404-if-t-f6a512-unleash-team.vercel.app) | | Oct 4, 2024 9:35am |

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