Fix: Add placeholder if no monitors to add

src/pages/StatusPage.vue

@@ -181,6 +181,9 @@
                         <option v-for="monitor in allMonitorList" :key="monitor.id" :value="monitor">{{ monitor.name }}</option>
                     </select>
                 </div>
+                <div v-else class="text-center">
+                    {{ $t("No monitors available.") }}  <router-link to="/add">{{ $t("Add one") }}</router-link>
+                </div>
             </div>
         </div>