fix: handle falsy dynamic components in SSR (#17542)

* fix: handle falsy dynamic components in SSR

Closes #17408

Adds a dynamic check for the component in the SSR.

Changes:
- Modified server-side component renderer to use b.maybe_call for dynamic components
- Added SSR test case for falsy component values

* fix types

---------

Co-authored-by: Rich Harris <rich.harris@vercel.com>

.changeset/purple-guests-punch.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: handle false dynamic components in SSR

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

@@ -295,22 +295,18 @@ export function build_inline_component(node, expression, context) {
 					b.array(props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p)))
 				);
 
+	const dynamic =
+		node.type === 'SvelteComponent' || (node.type === 'Component' && node.metadata.dynamic);
+
 	/** @type {Statement} */
 	let statement = b.stmt(
-		(node.type === 'SvelteComponent' ? b.maybe_call : b.call)(
-			expression,
-			b.id('$$renderer'),
-			props_expression
-		)
+		(dynamic ? b.maybe_call : b.call)(expression, b.id('$$renderer'), props_expression)
 	);
 
 	if (snippet_declarations.length > 0) {
 		statement = b.block([...snippet_declarations, statement]);
 	}
 
-	const dynamic =
-		node.type === 'SvelteComponent' || (node.type === 'Component' && node.metadata.dynamic);
-
 	if (custom_css_props.length > 0) {
 		statement = b.stmt(
 			b.call(

packages/svelte/tests/server-side-rendering/samples/falsy-dynamic-component/_expected.html

@@ -0,0 +1 @@
+<h1>Test</h1>

packages/svelte/tests/server-side-rendering/samples/falsy-dynamic-component/main.svelte

@@ -0,0 +1,6 @@
+<script>
+	let Component = $state();
+</script>
+
+<h1>Test</h1>
+<Component />