Use req2params middleware for instantiate named map endpoint

lib/cartodb/controllers/map.js

@@ -76,9 +76,20 @@ MapController.prototype.register = function(app) {
         this.req2paramsMiddleware,
         this.createPost.bind(this)
     );
-
-    app.get(app.base_url_templated + '/:template_id/jsonp', cors(), userMiddleware, this.jsonp.bind(this));
-    app.post(app.base_url_templated + '/:template_id', cors(), userMiddleware, this.instantiate.bind(this));
+    app.get(
+        app.base_url_templated + '/:template_id/jsonp',
+        cors(),
+        userMiddleware,
+        this.req2paramsMiddleware,
+        this.jsonp.bind(this)
+    );
+    app.post(
+        app.base_url_templated + '/:template_id',
+        cors(),
+        userMiddleware,
+        this.req2paramsMiddleware,
+        this.instantiate.bind(this)
+    );
     app.options(app.base_url_mapconfig, cors('Content-Type'));
 };
 
@@ -234,9 +245,6 @@ MapController.prototype.instantiateTemplate = function(req, res, prepareParamsFn
     var mapConfigProvider;
     var mapConfig;
     step(
-        function setupParams(){
-            self.req2params(req, res, this);
-        },
         function getTemplateParams() {
             prepareParamsFn(this);
         },

lib/cartodb/middleware/error-middleware.js

@@ -2,7 +2,7 @@ const _ = require('underscore');
 const debug = require('debug')('windshaft:cartodb:error-middleware');
 
 module.exports = function errorMiddleware (/* options */) {
-    return function (err, req, res, next) {
+    return function error (err, req, res, next) {
         // jshint unused:false
         // jshint maxcomplexity:9
         var allErrors = Array.isArray(err) ? err : [err];
@@ -122,6 +122,7 @@ function statusFromErrorMessage(errMsg) {
         }
     }
 
+
     return statusCode;
 }
 

lib/cartodb/middleware/req2params-middleware.js

@@ -127,6 +127,9 @@ module.exports = function req2paramsMiddleware (authApi, pgConnection) {
             },
             function finishSetup(err) {
                 if ( err ) {
+                    if (err.message && -1 !== err.message.indexOf('name not found')) {
+                        err.http_status = 404;
+                    }
                     req.profiler.done('req2params');
                     return next(err, req);
                 }