upgradeUrl should be false, no an string containing '', if upgrading is not appropiate
upgradeUrl should be false, no an string containing '', if upgrading is not appropiate

CartoDB/cartodb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,bloomberg/cartodb,bloomberg/cartodb,bloomberg/cartodb,splashblot/dronedb,bloomberg/cartodb,splashblot/dronedb,CartoDB/cartodb,splashblot/dronedb,codeandtheory/cartodb,splashblot/dronedb,codeandtheory/cartodb,bloomberg/cartodb,CartoDB/cartodb,codeandtheory/cartodb,codeandtheory/cartodb,codeandtheory/cartodb