Throw on invalid params argument

lib/cartodb/middleware/allow-query-params.js

@@ -1,4 +1,7 @@
 module.exports = function allowQueryParams(params) {
+    if (!Array.isArray(params)) {
+        throw new Error('allowQueryParams must receive an Array of params');
+    }
     return function allowQueryParamsMiddleware(req, res, next) {
         req.context.allowedQueryParams = params;
         next();