Backtrack on invalid zoom. Fixes #290
Backtrack on invalid zoom. Fixes #290

gravitystorm/carto,1ec5/carto,tomhughes/carto,whitelynx/carto,mapbox/carto,madeinqc/carto,stefanklug/carto,pnorman/carto,midnightcomm/carto,clhenrick/carto,CartoDB/carto,CartoDB/carto