Adds undefined checking when using isNaN.

Author: Simon Prickett

src/routes/capacity_routes.js

@@ -12,7 +12,7 @@ const controller = require('../controllers/capacity_controller');
  *  passed in, otherwise 10 as a default.
  * @private
  */
-const getLimit = n => (Number.isNaN(n) ? 10 : n);
+const getLimit = n => (Number.isNaN(n) || undefined === n ? 10 : n);
 
 // GET /capacity?limit=99
 router.get(

src/routes/meterreadings_routes.js

@@ -12,7 +12,7 @@ const controller = require('../controllers/meterreadings_controller');
  * @private
  */
 const getLimit = (n) => {
-  if (Number.isNaN(n)) {
+  if (Number.isNaN(n) || undefined === n) {
     return 100;
   }