Website components. Update chart component.

lib/web.js

@@ -7,17 +7,20 @@ export const apiRequest = (method, url, body) =>
       'Content-Type': 'application/json',
     },
     body,
-  }).then(res => (res.ok ? res.json() : null));
+  }).then(res => {
+    if (res.ok) {
+      return res.json();
+    }
+    return null;
+  });
 
-function parseQuery(url, params) {
-  const query =
-    params &&
-    Object.keys(params).reduce((values, key) => {
-      if (params[key] !== undefined) {
-        return values.concat(`${key}=${encodeURIComponent(params[key])}`);
-      }
-      return values;
-    }, []);
+function parseQuery(url, params = {}) {
+  const query = Object.keys(params).reduce((values, key) => {
+    if (params[key] !== undefined) {
+      return values.concat(`${key}=${encodeURIComponent(params[key])}`);
+    }
+    return values;
+  }, []);
   return query.length ? `${url}?${query.join('&')}` : url;
 }