Fix for map reload bug.
Fix for map reload bug.

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