New: Unmapped files view (#888)

* New: Unmapped files view

Displays all trackfiles that haven't been matched to a track.
Generalised the file details component and adds it to the album
details screen.

* Add sorting by quality

* New: MediaServiceTests & MediaRepoTests

frontend/src/Components/SignalRConnector.js

@@ -208,12 +208,12 @@ class SignalRConnector extends Component {
 
     if (body.action === 'updated') {
       this.props.dispatchUpdateItem({ section, ...body.resource });
-
-      // Repopulate the page to handle recently imported file
-      repopulatePage('trackFileUpdated');
     } else if (body.action === 'deleted') {
       this.props.dispatchRemoveItem({ section, id: body.resource.id });
     }
+
+    // Repopulate the page to handle recently imported file
+    repopulatePage('trackFileUpdated');
   }
 
   handleHealth = () => {