[IOT-1040] Fixed for jira issue about RH android.

[IOT-1040] Fixed for jira issue about RH android.

prevented crash when init is called with null String at address.

Change-Id: I390fdd036e6afae44af36d935564b2fa5045d990
Signed-off-by: jyong2.kim <jyong2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/6307
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Hun-je Yeon <hunje.yeon@samsung.com>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
(cherry picked from commit 9cbaf9309f0f671b899641a3ed2286621b5b6ed5)
Reviewed-on: https://gerrit.iotivity.org/gerrit/7687