fix(FlowEditor):修复事件选择器中自定义定义解析问题

- 在解析 customDef 时添加可选链操作符以避免空值错误
- 更新事件查找逻辑以兼容不同的数据结构
- 增强组件对缺失或无效 customDef 数据的处理能力

src/components/FlowEditor/nodeEditors/components/EventSelect.tsx

@@ -33,9 +33,9 @@ const EventSelect: React.FC<EventSelectProps> = ({ nodeData, eventList, type, on
     if (eventList && eventList.length > 0) {
       setOptions(eventList);
       try {
-        setCurrentEvent(eventList.find(item => JSON.parse(nodeData.component.customDef).eventId === item.id));
+        setCurrentEvent(eventList.find(item => JSON.parse(nodeData.component?.customDef).eventId === item.id));
       } catch (e) {
-        setCurrentEvent(eventList.find(item => nodeData.component.customDef.eventId === item.id));
+        setCurrentEvent(eventList.find(item => nodeData.component?.customDef.eventId === item.id));
       }
     }
   }, [eventList, nodeData]);