Fixed a segfault from occuring if to_wkb was called with a null geometry
Fixed a segfault from occuring if to_wkb was called with a null geometry

mapycz/mapnik,pramsey/mapnik,whuaegeanse/mapnik,tomhughes/mapnik,cjmayo/mapnik,pnorman/mapnik,pnorman/mapnik,davenquinn/python-mapnik,tomhughes/python-mapnik,zerebubuth/mapnik,mapycz/mapnik,cjmayo/mapnik,whuaegeanse/mapnik,yohanboniface/python-mapnik,pramsey/mapnik,lightmare/mapnik,cjmayo/mapnik,Uli1/mapnik,zerebubuth/mapnik,whuaegeanse/mapnik,tomhughes/python-mapnik,Uli1/mapnik,tomhughes/mapnik,Uli1/mapnik,yohanboniface/python-mapnik,naturalatlas/mapnik,garnertb/python-mapnik,mapnik/mapnik,mbrukman/mapnik,tomhughes/mapnik,tomhughes/mapnik,Uli1/mapnik,garnertb/python-mapnik,stefanklug/mapnik,pramsey/mapnik,CartoDB/mapnik,tomhughes/python-mapnik,mbrukman/mapnik,sebastic/python-mapnik,mapycz/python-mapnik,stefanklug/mapnik,mapycz/python-mapnik,naturalatlas/mapnik,Airphrame/mapnik,davenquinn/python-mapnik,sebastic/python-mapnik,pnorman/mapnik,stefanklug/mapnik,mbrukman/mapnik,manz/python-mapnik,stefanklug/mapnik,jwomeara/mapnik,Airphrame/mapnik,lightmare/mapnik,mapnik/mapnik,mapnik/python-mapnik,Airphrame/mapnik,zerebubuth/mapnik,mapnik/python-mapnik,mapnik/mapnik,mapnik/mapnik,jwomeara/mapnik,yohanboniface/python-mapnik,manz/python-mapnik,mbrukman/mapnik,cjmayo/mapnik,davenquinn/python-mapnik,whuaegeanse/mapnik,lightmare/mapnik,jwomeara/mapnik,CartoDB/mapnik,lightmare/mapnik,Airphrame/mapnik,naturalatlas/mapnik,CartoDB/mapnik,manz/python-mapnik,sebastic/python-mapnik,pramsey/mapnik,jwomeara/mapnik,pnorman/mapnik,mapnik/python-mapnik,garnertb/python-mapnik,mapycz/mapnik,naturalatlas/mapnik