fix: 基础组件增加过滤提示

ui/src/views/application-workflow/component/DropdownMenu.vue

@@ -11,6 +11,7 @@
 
       <el-tab-pane label="基础组件" name="base">
         <el-scrollbar height="400">
+          <div v-if="filter_menu_nodes.length > 0">
             <template v-for="(item, index) in filter_menu_nodes" :key="index">
               <div
                 class="workflow-dropdown-item cursor flex p-8-12"
@@ -24,6 +25,10 @@
                 </div>
               </div>
             </template>
+          </div>
+          <div v-else class="ml-16 mt-8">
+            <el-text type="info">没有找到相关结果</el-text>
+          </div>
         </el-scrollbar>
       </el-tab-pane>
       <el-tab-pane label="函数库" name="function">