fix(flowEditor):修复节点内容显示逻辑

- 从data.customDef中解构出topic字段
- 当topic包含'**empty**'时返回空字符串
- 优化事件名称的显示逻辑

src/pages/flowEditor/components/nodeContentOther.tsx

@@ -202,7 +202,8 @@ const formatFooter = (data: any, eventListOld = []) => {
           return `事件: ${currentEvent.name}`;
         }
         else {
-          const { name } = data.customDef;
+          const { name, topic } = data.customDef;
+          if (topic.includes('**empty**')) return '';
           return `事件: ${name}`;
         }
       case 'BASIC':