Implement 404 for documents

frontend/utils/ApiClient.js

@@ -1,4 +1,5 @@
 import _ from 'lodash';
+import { browserHistory } from 'react-router';
 import stores from 'stores';
 
 import constants from '../constants';
@@ -57,6 +58,11 @@ class ApiClient {
           return response;
         }
 
+        // Handle 404
+        if (response.status === 404) {
+          return browserHistory.push('/404');
+        }
+
         // Handle 401, log out user
         if (response.status === 401) {
           stores.user.logout();