Thumbnail placeholder as icon; Fixing non-loading categories on refresh

src/js/services/spotify/actions.js

@@ -442,7 +442,7 @@ export function getCategory(id) {
             type: 'SPOTIFY_CATEGORY_LOADED',
             category: {
               uri: `category:${response.id}`,
-              playlist_uris: [],
+              playlist_uris: null,
               ...response,
             },
           });

src/js/services/spotify/reducer.js

@@ -176,12 +176,11 @@ export default function reducer(spotify = {}, action) {
       var categories = { ...spotify.categories };
       var playlists_uris = [];
 
-      if (categories[action.uri].playlists_uris) {
+      if (categories[action.uri] && categories[action.uri].playlists_uris) {
         playlists_uris = categories[action.uri].playlists_uris;
       }
 
       var category = {
-
         ...categories[action.uri],
         playlists_uris: [...playlists_uris, ...action.uris],
         playlists_more: action.more,