Fixed pointer-type arrays with NULL values

Fixed pointer-type arrays with NULL values

NULL values for OCRepresentation and string types in an array would
cause a variety of seg-faults.  This patch corrects the behavior to
allow for NULLs in these arrays.

This is necessary because the CSDK enforces rectangular arrays, but
the C++ stack does NOT, so it compiles with those dimensions.

Change-Id: Ie0ddc5faea980ccb37f0ac8f6b73027b965b7257
Signed-off-by: Erich Keane <erich.keane@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2452
Reviewed-by: Sachin Agrawal <sachin.agrawal@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>