Return false on validation error.
Return false on validation error.

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