add a skeleton instead of empty logos

pages/structures/index.vue

@@ -207,7 +207,14 @@
                         :contain="true"
                         style="margin: 12px;"
                       />
-                      <div v-else style="height: 104px; width: 264px"></div>
+                      <v-skeleton-loader
+                        v-else
+                        type="card-avatar"
+                        boilerplate
+                        width="164px"
+                        height="84px"
+                        style="margin: 10px 50px;"
+                      />
                     </div>
 
                     <div :class="'d-flex flex-column' + (listview ? ' flex-grow-1' : '')">