fix: else branch of `each` block

packages/svelte/src/compiler/phases/3-transform/server/visitors/EachBlock.js

@@ -57,7 +57,7 @@ export function EachBlock(node, context) {
 			b.if(
 				b.binary('!==', b.member(array_id, 'length'), b.literal(0)),
 				b.block([open, for_loop]),
-				fallback
+				node.fallback.metadata.has_await ? create_async_block(fallback) : fallback
 			)
 		);
 	} else {

packages/svelte/tests/server-side-rendering/samples/each-body-async/main.svelte

@@ -1,3 +1,5 @@
 {#each { length: 1 } as _}
   {@const data = await Promise.resolve("data")}
+  {:else}
+  {@const data = await Promise.resolve("data")}
 {/each}