fix browser blank page on gateways (#8453)

StorageInfo component will not be rendered if
Storage used is null.

browser/app/js/browser/StorageInfo.js

@@ -26,7 +26,13 @@ export class StorageInfo extends React.Component {
   }
   render() {
     const { used } = this.props.storageInfo
-    var totalUsed = used.reduce((v1, v2) => v1 + v2, 0)
+
+    if (!used) {
+      return <noscript />
+    }
+
+    const totalUsed = used.reduce((v1, v2) => v1 + v2, 0)
+
     return (
       <div className="feh-used">
         <div className="fehu-chart">

browser/app/js/browser/__tests__/StorageInfo.test.js

@@ -35,4 +35,15 @@ describe("StorageInfo", () => {
     )
     expect(fetchStorageInfo).toHaveBeenCalled()
   })
+
+  it("should not render anything if used is null", () => {
+    const fetchStorageInfo = jest.fn()
+    const wrapper = shallow(
+      <StorageInfo
+        storageInfo={{ used: null }}
+        fetchStorageInfo={fetchStorageInfo}
+      />
+    )
+    expect(wrapper.text()).toBe("")
+  })
 })