Handle errors better

assets/js/dashboard/api.js

@@ -22,5 +22,9 @@ export function serializeQuery(query, extraQuery=[]) {
 
 export function get(url, query, ...extraQuery) {
   url = url + serializeQuery(query, extraQuery)
-  return fetch(url).then(res => res.json())
+  return fetch(url)
+    .then( response => {
+      if (!response.ok) { throw response }
+      return response.json()
+    })
 }

assets/js/dashboard/stats/current-visitors.js

@@ -20,7 +20,10 @@ export default class CurrentVisitors extends React.Component {
 
   updateCount() {
     return fetch(`/api/stats/${encodeURIComponent(this.props.site.domain)}/current-visitors`)
-      .then(res => res.json())
+      .then( response => {
+        if (!response.ok) { throw response }
+        return response.json()
+      })
       .then((res) => this.setState({currentVisitors: res}))
   }