fix: remove unnecessary update assignments (#13113)

Fixes #13111

Author: paoloricciuti

.changeset/itchy-oranges-behave.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: remove unnecessary update assignments

packages/svelte/src/compiler/phases/3-transform/client/visitors/RegularElement.js

@@ -248,8 +248,8 @@ export function RegularElement(node, context) {
 								: `="${value === true ? '' : escape_html(value, true)}"`
 						}`
 					);
-					continue;
 				}
+				continue;
 			}
 
 			const is = is_custom_element

packages/svelte/tests/runtime-runes/samples/empty-class-attribute-template/_config.js

@@ -0,0 +1,6 @@
+import { ok, test } from '../../test';
+import { flushSync } from 'svelte';
+
+export default test({
+	html: `<div></div><div></div>`
+});

packages/svelte/tests/runtime-runes/samples/empty-class-attribute-template/main.svelte

@@ -0,0 +1,2 @@
+<div class=""></div>
+<div class=""></div>