hotfix: emit the missing event, fix check condition

Author: XiaochenCui

src/backend/src/modules/puterfs/lib/PuterFSProvider.js

@@ -722,6 +722,10 @@ class PuterFSProvider extends putility.AdvancedBase {
         (async () => {
             await entryOp.awaitDone();
             resourceService.free(uid);
+            svc_event.emit('fs.written.file', {
+                node,
+                context: this.context,
+            });
         })();
 
         state_upload.post_insert({

src/backend/src/services/worker/WorkerService.js

@@ -98,7 +98,7 @@ class WorkerService extends BaseService {
             const result = await svc_su.sudo(async ()=> {
                 return await es_subdomain.select({ predicate: new Eq({ key: "root_dir", value: data.node }) });
             });
-            if (!result) 
+            if (!result || result.length === 0)
                 return;
 
             // Person who just wrote file (not necessarily file owner)