Fix 'geometry' attr of layer creation/editing.
Fix 'geometry' attr of layer creation/editing.

Teino1978-Corp/Teino1978-Corp-tilemill,mbrukman/tilemill,Zhao-Qi/tilemill,mbrukman/tilemill,tilemill-project/tilemill,tizzybec/tilemill,mbrukman/tilemill,MappingKat/tilemill,tizzybec/tilemill,MappingKat/tilemill,fxtentacle/tilemill,florianf/tileoven,paulovieira/tilemill-clima,mbrukman/tilemill,nyimbi/tilemill,isaacs/tilemill,paulovieira/tilemill-clima,tizzybec/tilemill,nyimbi/tilemill,florianf/tileoven,fxtentacle/tilemill,tizzybec/tilemill,fxtentacle/tilemill,isaacs/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,isaacs/tilemill,fxtentacle/tilemill,Zhao-Qi/tilemill,Zhao-Qi/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,paulovieira/tilemill-clima,tilemill-project/tilemill,MappingKat/tilemill,paulovieira/tilemill-clima,tizzybec/tilemill,fxtentacle/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill,tilemill-project/tilemill,Zhao-Qi/tilemill,mbrukman/tilemill,florianf/tileoven,paulovieira/tilemill-clima,nyimbi/tilemill,MappingKat/tilemill,Zhao-Qi/tilemill,nyimbi/tilemill,MappingKat/tilemill