#3940 use @noop instead of null

src/compiler/compile/render_dom/index.ts

@@ -475,9 +475,11 @@ export default function dom(
 				constructor(options) {
 					super();
 
-					${css.code && b`this.shadowRoot.innerHTML = \`<style>${css.code.replace(/\\/g, '\\\\')}${options.dev ? `\n/*# sourceMappingURL=${css.map.toUrl()} */` : ''}</style>\`;`}
+					const add_css = ${css.code
+						?	(b`() => this.shadowRoot.innerHTML = \`<style>${css.code.replace(/\\/g, '\\\\')}${options.dev ? `\n/*# sourceMappingURL=${css.map.toUrl()} */` : ''}</style>\`;`)
+						: x`@noop`}
 
-					@init(this, { target: this.shadowRoot, props: @attribute_to_object(this.attributes) }, ${definition}, ${has_create_fragment ? 'create_fragment': 'null'}, ${not_equal}, ${prop_indexes}, null, ${dirty});
+					@init(this, { target: this.shadowRoot, props: @attribute_to_object(this.attributes) }, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${add_css}, ${dirty});
 
 					${dev_props_check}
 
@@ -528,7 +530,7 @@ export default function dom(
 			class ${name} extends ${superclass} {
 				constructor(options) {
 					super(${options.dev && 'options'});
-					@init(this, options, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${should_add_css ? add_css : null}, ${dirty});
+					@init(this, options, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${should_add_css ? add_css : x`@noop`}, ${dirty});
 					${options.dev && b`@dispatch_dev("SvelteRegisterComponent", { component: this, tagName: "${name.name}", options, id: create_fragment.name });`}
 
 					${dev_props_check}

src/runtime/internal/Component.ts

@@ -130,7 +130,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 
 	let ready = false;
 
-	add_css && add_css($$.customStyleTag);
+	add_css($$.customStyleTag);
 
 	$$.ctx = instance
 		? instance(component, prop_values, (i, ret, ...rest) => {