Don't post SCAN message when no process

src/services/database.service.ts

@@ -147,7 +147,9 @@ export class Database {
         const activeWorker = this.serviceWorkerRegistration.active || (await this.waitForServiceWorkerActivation(this.serviceWorkerRegistration));
         const service = await Services.getInstance();
         const payload = await service.getMyProcesses();
+        if (payload.length != 0) {
           activeWorker?.postMessage({ type: 'SCAN', payload });
+        }
       }, 5000); 
     } catch (error) {
       console.error('Service Worker registration failed:', error);