fix config validation test - closes #1655
fix config validation test - closes #1655

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