MS-611 Add resources validity check in ResourceMgr

        }

        auto tasks = build_task(job);

        auto disk_list = res_mgr_->GetDiskResources();

        if (!disk_list.empty()) {

            if (auto disk = disk_list[0].lock()) {

        // disk resources NEVER be empty.

        if (auto disk = res_mgr_->GetDiskResources()[0].lock()) {

            for (auto& task : tasks) {

                disk->task_table().Put(task);

            }

        }

    }

}

}

std::vector<TaskPtr>

JobMgr::build_task(const JobPtr& job) {