fix: correctly transform pre with no content (#14973)

Closes #14971

Author: paoloricciuti

.changeset/spicy-insects-check.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: correctly transform `pre` with no content

packages/svelte/src/compiler/phases/3-transform/utils.js

@@ -272,7 +272,7 @@ export function clean_nodes(
 	var first = trimmed[0];
 
 	// initial newline inside a `<pre>` is disregarded, if not followed by another newline
-	if (parent.type === 'RegularElement' && parent.name === 'pre' && first.type === 'Text') {
+	if (parent.type === 'RegularElement' && parent.name === 'pre' && first?.type === 'Text') {
 		const text = first.data.replace(regex_starts_with_newline, '');
 		if (text !== first.data) {
 			const tmp = text.replace(regex_starts_with_newline, '');

packages/svelte/tests/runtime-runes/samples/pre-no-content/_config.js

@@ -0,0 +1,5 @@
+import { test } from '../../test';
+
+export default test({
+	html: `<pre></pre>`
+});

packages/svelte/tests/runtime-runes/samples/pre-no-content/main.svelte

@@ -0,0 +1 @@
+<pre></pre>