[DEV-12308] Feature - Show a 404 page if category is empty

[kudlajz]

I think it doesn't make sense to show the category page if there's no stories published in it.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
theme-nextjs-bea-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2024 1:27pm

3 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **theme-nextjs-bea-cookbook** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-cookbook/C9DPmS4NQzD7337m9ZWWbbHVoAiu)) | [Visit Preview](https://theme-nextjs-bea-cookbook-git-feature-dev-12308-e2e74e-prezly1.vercel.app) | | Jun 5, 2024 1:27pm | | **theme-nextjs-bea-photography** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-photography/eSe8CfPexXGhfKevJz9ySKX4yNwQ)) | | | Jun 5, 2024 1:27pm | | **theme-nextjs-bea-the-good-newsroom** | ⬜️ Ignored ([Inspect](https://vercel.com/prezly/theme-nextjs-bea-the-good-newsroom/5YG6887GA9pGoNnyjJWVrQQpKue9)) | [Visit Preview](https://theme-nextjs-bea-the-good-newsroom-git-feature-d-f82769-prezly1.vercel.app) | | Jun 5, 2024 1:27pm |