Return a 404 when the conversation id is not found

[GromNaN]

Going to /conversation/1234 (where conversation with id 1234 does not exist), an error 404 is expected. Got 500.

symfony-chatgpt-ux/src/Twig/Components/ChatboxComponent.php

Lines 28 to 37 in 1e51d3d

	public function mount(
	string $id = null,
	): void {
	if ($id) {
	// @todo catch not found exception
	$this->conversation = $this->documentManager->find(Conversation::class, $id);
	} else {
	$this->conversation = new Conversation();
	}
	}