handle export {...} in script, fix test

src/compile/Component.ts

@@ -462,6 +462,7 @@ export default class Component {
 
 					code.remove(node.start, node.declaration.start);
 				} else {
+					removeNode(code, content.start, content.end, content.body, node);
 					node.specifiers.forEach(specifier => {
 						exports.push({
 							name: specifier.local.name,

test/runtime/samples/dynamic-component-in-if/main.html

@@ -2,6 +2,7 @@
 	import Foo from './Foo.html';
 	import Bar from './Bar.html';
 
+	export { Bar };
 	export let x = Foo;
 </script>