Do not use underscore

lib/cartodb/models/mapconfig/provider/named-map-provider.js

@@ -1,4 +1,3 @@
-var _ = require('underscore');
 var crypto = require('crypto');
 var dot = require('dot');
 var MapConfig = require('windshaft').model.MapConfig;
@@ -62,16 +61,17 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function (callback) {
             return callback(err);
         }
 
-        const { owner, rendererParams } = this;
-
         var templateParams = {};
 
         if (this.config) {
             try {
-                templateParams = _.isString(this.config) ? JSON.parse(this.config) : this.config;
+                templateParams = Object.prototype.toString.call(this.config) === '[object String]' ?
+                    JSON.parse(this.config) :
+                    this.config;
             } catch (e) {
                 const error = new Error('malformed config parameter, should be a valid JSON');
                 this.err = error;
+
                 return callback(err);
             }
         }
@@ -93,6 +93,8 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function (callback) {
                 return callback(err);
             }
 
+            const { owner, rendererParams } = this;
+
             this.mapConfigAdapter.getMapConfig(owner, requestMapConfig, rendererParams, context, (err, mapConfig) => {
                 if (err) {
                     this.err = err;
@@ -236,7 +238,7 @@ var baseKeyTpl = dot.template(baseKey);
 var rendererKeyTpl = dot.template(rendererKey);
 
 NamedMapMapConfigProvider.prototype.createKey = function(base) {
-    var tplValues = _.defaults({}, this.params, {
+    var tplValues = Object.assign({
         dbname: '',
         owner: this.owner,
         templateName: this.templateName,
@@ -244,7 +246,8 @@ NamedMapMapConfigProvider.prototype.createKey = function(base) {
         configHash: configHash(this.config),
         layer: '',
         scale_factor: 1
-    });
+    }, this.params);
+
     return (base) ? baseKeyTpl(tplValues) : rendererKeyTpl(tplValues);
 };
 
@@ -258,9 +261,7 @@ function configHash(config) {
 module.exports.configHash = configHash;
 
 NamedMapMapConfigProvider.prototype.getDBParams = function(cdbuser, callback) {
-    const dbParams = _.extend({}, this.params, {
-        user: this.owner
-    });
+    const dbParams = Object.assign({ user: this.owner }, this.params);
 
     this.pgConnection.getDatabaseParams(cdbuser, (err, databaseParams) => {
         if (err) {