fix: rollup conf

Author: loks0n

templates/web/rollup.config.js.twig

@@ -2,7 +2,7 @@ import pkg from "./package.json";
 import typescript from "@rollup/plugin-typescript";
 
 export default {
-    external: Object.keys(pkg.dependencies),
+    external: Object.keys(pkg.dependencies ?? {}),
     input: "src/index.ts",
     plugins: [typescript()],
     output: [