🐛 HTML parser does not allow Svelte `{#await}` with a `{:catch}` and no `{:then}`

### Environment information

```block
playground
```

### What happened?

https://biomejs.dev/playground/?code=ewAjAGEAdwBhAGkAdAAgAGYAaQBuAGkAeABJAG4AaQB0AH0ACgAgACAAIAAgADwASQBjAG8AbgBzAC4ARABvAHQAcwBCAG8AdQBuAGMAZQAgAC8APgAKAHsAOgBjAGEAdABjAGgAIABlAHIAcgBvAHIAfQAKACAAIAAgACAAPABwAD4AQwBvAHUAbABkACAAbgBvAHQAIABpAG4AaQB0AGkAYQBsAGkAegBlACAAZgBvAHIAbQA6ACAAewBlAHIAcgBvAHIALgBtAGUAcwBzAGEAZwBlAH0APAAvAHAAPgAKAHsALwBhAHcAYQBpAHQAfQA%3D&language=svelte

### Expected result

Should parse.

### Code of Conduct

- [x] I agree to follow Biome's Code of Conduct

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Uh oh!

🐛 HTML parser does not allow Svelte `{#await}` with a `{:catch}` and no `{:then}` #8517

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Uh oh!

🐛 HTML parser does not allow Svelte {#await} with a {:catch} and no {:then} #8517

Description

Environment information

What happened?

Expected result

Code of Conduct

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

🐛 HTML parser does not allow Svelte `{#await}` with a `{:catch}` and no `{:then}` #8517