Hide no category label when no sessions are available

assets/vue/components/session/SessionListNoCategoryWrapper.vue

@@ -1,5 +1,5 @@
 <template>
-    <div>
+    <div v-if="sessions.length > 0">
       <h5 class="mb-2">
         <BaseIcon icon="folder-generic"/>
         {{ $t('No category') }}

assets/vue/views/user/sessions/SessionsLoading.vue

@@ -5,7 +5,7 @@
   >
     <Skeleton class="h-8 w-44"/>
     <div class="hidden md:block md:col-span-1 lg:col-span-3 "></div>
-    <Skeleton v-for="el in 4" :key="el" class="h-44"/>
+    <Skeleton v-for="el in 4" :key="el" class="h-44 xl:h-60"/>
   </div>
 </template>