HAbackupRecover at 06 Dec 2018 10:59:16

<img src="https://jenkins.onosproject.org/view/QA/job/postjob-Fabric/lastSuccessfulBuild/artifact/HAbackupRecover_master_20-builds_graph.jpg", alt="HAbackupRecover", style="width:525px;height:350px;border:0">
commit c97849c19bfc75ba48f4fe0c9c464138c7364ee5 (HEAD -] master, origin/master, origin/HEAD)
Author: kezhiyong [ke.zhiyong@zte.com.cn]
AuthorDate: Mon Dec 3 16:14:29 2018 +0800
Commit: Andrea Campanella [andrea@opennetworking.org]
CommitDate: Thu Dec 6 01:54:36 2018 +0000

If link list if null or empty, the following code links.get(0) will get an error.

Case 1: Starting up 7 node(s) ONOS cluster - FAIL