Fix(booking-job): Handle sql query builder when no running task

backend/internal/ktmtrainbot/backgroundbookingjob.go

@@ -54,11 +54,19 @@ func (env *Env) BackgroundJobRunner() {
 		}
 
 		var jobToDo Booking
-		err := tx.Model(&jobToDo).
-			Where("user_id NOT IN (?)", userIDArr).
-			Where("status = ?", "pending").
-			Preload("User").
-			First(&jobToDo).Error
+		var err error
+		if len(userIDArr) > 0 {
+			err = tx.Model(&jobToDo).
+				Where("user_id NOT IN (?)", userIDArr).
+				Where("status = ?", "pending").
+				Preload("User").
+				First(&jobToDo).Error
+		} else {
+			err = tx.Model(&jobToDo).
+				Where("status = ?", "pending").
+				Preload("User").
+				First(&jobToDo).Error
+		}
 
 		// if no jobs pending found
 		if err != nil {