tree 2e0eab53c98964c27778811f3505d8e53cb608b8
parent 43a7932ed219787fb94c81d2a2ae8d14e268f865
author Junxiao Shi <git@mail1.yoursunny.com> 1470635650 +0000
committer Junxiao Shi <git@mail1.yoursunny.com> 1470635650 +0000

face: accommodate empty InterestCallback/DataCallback/NackCallback

refs #3724

Change-Id: Iebfeae48d37d6dedbbdbca2a05730247807675d5