hide dropdown menu on desktop when no project selected

src/App.vue

@@ -14,6 +14,7 @@
           </router-link>
 
           <div
+            v-if="width <= 560 || (width > 560 && project)"
             id="menu-dropdown"
             :class="['ui dropdown item', { 'active visible': menuIsOpen }]"
             @click="menuIsOpen = !menuIsOpen"
@@ -178,6 +179,7 @@ export default {
       menuIsOpen: false,
       rightMenuIsOpen: true,
       messages: null,
+      width: window.innerWidth > 0 ? window.innerWidth : screen.width,
     };
   },