Test for returned nullptr before passing them to std::string constructor (closes #192)
Test for returned nullptr before passing them to std::string constructor (closes #192)

j-o/glbinding,j-o/glbinding,j-o/glbinding,mcleary/glbinding,mcleary/glbinding,cginternals/glbinding,hpicgs/glbinding,mcleary/glbinding,cginternals/glbinding,j-o/glbinding,mcleary/glbinding,hpicgs/glbinding,hpicgs/glbinding,hpicgs/glbinding