xml2js: do not throw exception on unknown object type
xml2js: do not throw exception on unknown object type

Signed-off-by: Nicolas Oliver <20d36bc264582663740c7fbd44ac057f4dd34220@intel.com>

intel-iot-devkit/doxygen2jsdoc,intel-iot-devkit/doxygen2jsdoc,intel-iot-devkit/doxygen2jsdoc