Medium Support (Multi-disc Albums), Quality Grouping (#121)

* Multi Disc Stage 1 - Backend Work

* Quality Group Functionality

* Fixed: Only show wanted album types on ArtistDetail page

* Add Media Count Column to ArtistDetail Page

* Parser updates for multidisc cases, other usenet release title formats

* Search for Tracks by Medium Number in Addition to Title and TrackNumber

* Medium Renaming Token for Track Naming

* fixup Codacy and Comment Cleanup

* fixup remove comments

frontend/src/Components/Form/RootFolderSelectInputConnector.js

@@ -33,7 +33,8 @@ function createMapStateToProps() {
         values.push({
           key: '',
           value: '',
-          isDisabled: true
+          isDisabled: true,
+          isHidden: true
         });
       }
 
@@ -64,6 +65,18 @@ class RootFolderSelectInputConnector extends Component {
   //
   // Lifecycle
 
+  componentWillMount() {
+    const {
+      value,
+      values,
+      onChange
+    } = this.props;
+
+    if (value == null && values[0].key === '') {
+      onChange({ name, value: '' });
+    }
+  }
+
   componentDidMount() {
     const {
       name,