Fix Issue 33 reported by iacobcatalin: Crash loading a file with a surface inside an element that is not handled by libcitygml
Fix Issue 33 reported by iacobcatalin: Crash loading a file with a surface inside an element that is not handled by libcitygml
jpouderoux/libcitygml,terencechill/libcitygml,yangqiaosheng/libcitygml,flyskyosg/libcitygml