fix: improve loadReminder method to handle file reading errors and return empty array if file does not exist

services/notifikasi-wa.service.js

@@ -249,8 +249,12 @@ class NotifikasiWaService {
   }
 
   async loadReminder() {
-    if (!fs.existsSync(filePath)) return [];
-    return JSON.parse(fs.readFileSync(filePath));
+    try {
+      const raw = await fs.readFile(filePath, 'utf-8');
+      return raw ? JSON.parse(raw) : [];
+    } catch (err) {
+      return []; // file belum ada
+    }
   }
 
   async deleteReminder(id) {