tree f264220a5dee7304df8ed914310edc5dec81e296
parent 0616390dba145a4a21f994fa294b5e1ae35d3ca3
author kezhiyong <ke.zhiyong@zte.com.cn> 1543824869 +0800
committer Andrea Campanella <andrea@opennetworking.org> 1544061276 +0000

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

Change-Id: I51c1cdc374f1b550e942826fb65acb40161f7d86