Save the current task

        :returns: None
        :rtype: None
        :raises: None

def task_save(self, ):
        """Save the current task

        :returns: None
        :rtype: None
        :raises: None
        """
        if not self.cur_task:
            return
        deadline = self.task_deadline_de.dateTime().toPython()
        status = self.task_status_cb.currentText()
        self.cur_task.deadline = deadline
        self.cur_task.status = status
        self.cur_task.save()