added mail for user activation, handled fcm token for deleted user

base/tasks.py

@@ -48,6 +48,7 @@ def notify_task_expiry():
     :return:
     """
     all_pending_tasks = JuniorTask.objects.filter(
+        junior__is_verified=True,
         task_status__in=[PENDING, IN_PROGRESS],
         due_date__range=[datetime.datetime.now().date(),
                          (datetime.datetime.now().date() + datetime.timedelta(days=1))])