Throw OcException for invalid (null) parameters in Java Layer of android_api

Throw OcException for invalid (null) parameters in Java Layer of android_api

[IOT-1323] -- [RI][Android] observe(with QualityOfService) API does not throw OcException while passing parameter-observeType as Null value

Change-Id: If0d7acb0f5bbfda75e2fd774b6cccc8ce21e5650
Signed-off-by: Larry Sachs <larry.j.sachs@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/12571
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Rick Bell <richard.s.bell@intel.com>