fix(JoinFamily): 添加可选链操作符防止未定义错误

@@ -253,8 +253,8 @@ const filteredFamilies = computed(() => {
     return mockFamilies.value
   }
   return mockFamilies.value.filter(family =>
-    family.name.includes(searchKeyword.value) ||
-    family.description.includes(searchKeyword.value)
+    family.name?.includes(searchKeyword.value) ||
+    family.description?.includes(searchKeyword.value)
   )
 });