Avoid regression and update comment

lib/cartodb/controllers/map.js

@@ -332,16 +332,15 @@ MapController.prototype.afterLayergroupCreate = function (req, res, callback) {
         }
     };
 
-    // Don't wait for the mapview count increment to
-    // take place before proceeding. Error will be logged
-    // asynchronously
+    // Perform mapview count increment in parallel along the rest of after-layergroup-create
+    // tasks. Error won't blow up, just logged.
     this.metadataBackend.incMapviewCount(user, mapconfig.obj().stat_tag, function(err) {
         req.profiler.done('incMapviewCount');
         if ( err ) {
             global.logger.log("ERROR: failed to increment mapview count for user '" + user + "': " + err);
         }
 
-        done(err);
+        done();
     });
 
     step(
@@ -383,7 +382,7 @@ MapController.prototype.augmentLayergroupData = function (req, res, callback) {
     _.extend(layergroup, global.environment.serverMetadata);
 
     callback();
-}
+};
 
 MapController.prototype.getAffectedTables = function (req, res, callback) {
     const self = this;