dont attempt to create a std::string from NULL in as_string()
dont attempt to create a std::string from NULL in as_string()

attie/jansson,firepick1/jansson,chrullrich/jansson,OlehKulykov/jansson,Mephistophiles/jansson,liu3tao/jansson,rogerz/jansson,gameclosure/jansson,janetuk/jansson,akheron/jansson-debian,gameclosure/jansson,akheron/jansson,yahoo/ygloo-external-jansson,akheron/jansson-debian,simonfojtu/FireSight,akheron/jansson,rogerz/jansson,janetuk/jansson,yahoo/ygloo-external-jansson,janetuk/jansson,akheron/jansson,firepick1/FireSight,Mephistophiles/jansson,akheron/jansson-debian,markalanj/jansson,firepick1/jansson,npmccallum/jansson,Vorne/jansson,attie/jansson,firepick1/FireSight,slackner/jansson,bstarynk/jansson,firepick-delta/FireSight,firepick-delta/FireSight,wirebirdlabs/featherweight-jansson,simonfojtu/FireSight,simonfojtu/FireSight,Vorne/jansson,yahoo/ygloo-external-jansson,firepick-delta/FireSight,slackner/jansson,AmesianX/jansson,bstarynk/jansson,firepick1/jansson,bstarynk/jansson,janetuk/jansson,rogerz/jansson,akheron/jansson-debian,markalanj/jansson,gameclosure/jansson,wirebirdlabs/featherweight-jansson,chrullrich/jansson,OlehKulykov/jansson,yahoo/ygloo-external-jansson,liu3tao/jansson,npmccallum/jansson,firepick1/FireSight,rogerz/jansson,markalanj/jansson,AmesianX/jansson