Add null checking for observe request in easy setup
Add null checking for observe request in easy setup

Checking if entityHandlerRequest is NULL is added.

Change-Id: I79bf75c9f53f28b9c0c679a5dd7371552764b5cd
Signed-off-by: Jihun Ha <3b6954bd112a2585eced0b86af3c85401a826886@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13323
Reviewed-by: Heewon Park <654100d0d1c7f20a9144c38760887b80638a89ed@samsung.com>
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Madan Lanka <f0ab8ffa6f9be130982d9ec09d220706b52daee1@samsung.com>

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