Document: Avoid possible null pointer dereference
Document: Avoid possible null pointer dereference

* libxml++/document.cc: In create_root_node() check that 'element' is
non-null before it's used. Bug #732604.

xf22001/libxmlpp,GNOME/libxmlmm,xf22001/libxmlpp,dtrebbien/libxmlmm,GNOME/libxmlmm,dtrebbien/libxmlmm,boomuuh/libxml-cpp,GNOME/libxmlmm,xf22001/libxmlpp,GNOME/libxmlmm,boomuuh/libxml-cpp,boomuuh/libxml-cpp,dtrebbien/libxmlmm