Fix vizzjson error when map bounds not present
Fix vizzjson error when map bounds not present

DigitalCoder/cartodb,dbirchak/cartodb,CartoDB/cartodb,raquel-ucl/cartodb,nuxcode/cartodb,CartoDB/cartodb,codeandtheory/cartodb,nyimbi/cartodb,nyimbi/cartodb,DigitalCoder/cartodb,UCL-ShippingGroup/cartodb-1,splashblot/dronedb,future-analytics/cartodb,bloomberg/cartodb,codeandtheory/cartodb,nuxcode/cartodb,dbirchak/cartodb,raquel-ucl/cartodb,codeandtheory/cartodb,raquel-ucl/cartodb,bloomberg/cartodb,nyimbi/cartodb,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1,CartoDB/cartodb,splashblot/dronedb,CartoDB/cartodb,dbirchak/cartodb,future-analytics/cartodb,bloomberg/cartodb,thorncp/cartodb,thorncp/cartodb,future-analytics/cartodb,future-analytics/cartodb,thorncp/cartodb,UCL-ShippingGroup/cartodb-1,DigitalCoder/cartodb,raquel-ucl/cartodb,CartoDB/cartodb,thorncp/cartodb,nyimbi/cartodb,nuxcode/cartodb,nuxcode/cartodb,nyimbi/cartodb,bloomberg/cartodb,nuxcode/cartodb,DigitalCoder/cartodb,raquel-ucl/cartodb,UCL-ShippingGroup/cartodb-1,dbirchak/cartodb,codeandtheory/cartodb,splashblot/dronedb,thorncp/cartodb,DigitalCoder/cartodb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,splashblot/dronedb,future-analytics/cartodb,splashblot/dronedb,bloomberg/cartodb