Resolve "Hide favorites radios when user does not have any favorites"

changes/changelog.d/419.enhancement

@@ -0,0 +1 @@
+Favorites radio will not be visible if the user does not have any favorites (#419)

front/src/components/favorites/List.vue

@@ -16,7 +16,7 @@
           1 favorite
         </translate>
       </h2>
-      <radio-button type="favorites"></radio-button>
+      <radio-button v-if="hasFavorites" type="favorites"></radio-button>
     </section>
     <section class="ui vertical stripe segment">
       <div :class="['ui', {'loading': isLoading}, 'form']">
@@ -115,7 +115,10 @@ export default {
       return {
         title: this.$pgettext('Head/Favorites/Title', 'Your Favorites')
       }
-    }
+    },
+    hasFavorites () {
+      return this.$store.state.favorites.count > 0
+    },
   },
   methods: {
     updateQueryString: function() {

front/src/components/library/Radios.vue

@@ -10,7 +10,7 @@
           <translate translate-context="Content/Radio/Title">Instance radios</translate>
         </h3>
         <div class="ui cards">
-          <radio-card v-if="$store.state.auth.authenticated" :type="'favorites'"></radio-card>
+          <radio-card v-if="isAuthenticated && hasFavorites" :type="'favorites'"></radio-card>
           <radio-card :type="'random'"></radio-card>
           <radio-card v-if="$store.state.auth.authenticated" :type="'less-listened'"></radio-card>
         </div>
@@ -144,7 +144,13 @@ export default {
         searchPlaceholder,
         title
       }
-    }
+    },
+    isAuthenticated () {
+      return this.$store.state.auth.authenticated
+    },
+    hasFavorites () {
+      return this.$store.state.favorites.count > 0
+    },
   },
   methods: {
     updateQueryString: _.debounce(function() {