feat(node-subsync): add missing arg msg

devices/nos/modules/subtitles/syncing/node-syncsub/main.ts

@@ -4,6 +4,8 @@ const SUB_EXT_LENGTH = 7;
 
 
 const FILE = process.argv[2];
+
+const main = () => {
     const BASE_NAME = FILE.substring(
         FILE.lastIndexOf('/') + 1,
         FILE.length - SUB_EXT_LENGTH,
@@ -41,3 +43,13 @@ readdir(DIR, (_, files) => {
         // TODO: actually call the command
         console.log(cmd);
     });
+};
+
+if (FILE) {
+    main();
+    process.exit();
+}
+else {
+    console.error('Error: no argument passed');
+    process.exit(1);
+}