Handle IO errors in shp_normalizer (#741)
Handle IO errors in shp_normalizer (#741)

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