Fix API of ThingsManger.

Fix API of ThingsManger.

subscribeCollectionPresence and findCandidateResource are occurred exception or
no response(callback) while to combine resource type
when child resource doesn't have correct type name of resource.

In this case we don't combine the type of resource and
we will ignore.

Fix [IOT-289]

Change-Id: I59c48726a9738e34d6c5561b59a2cdda243168ec
Signed-off-by: HyunJun Kim <hyunjun2.kim@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/277
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>