fix: missing tank icon handling

packages/website-ue/src/pages/api/tanks/[id].webp.ts

@@ -7,5 +7,8 @@ export { getStaticPaths } from "./[id].pb";
 export async function GET({ params }: APIContext<never, { id: string }>) {
   const tank = await api.tank(params.id);
   const image = game.tankBigIcon(params.id, tank.tank!.visual_data);
+
+  if (image.length === 0) return new Response(null, { status: 404 });
+
   return new Response(new Uint8Array(image));
 }