fix(Cascader): check if options exists before use options.length #18190
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🔗 Related issue link
💡 Background and solution
在 #17538 中增加了对
options.length不同情况的处理。在该 pull 合并之前的版本是不会报错的。我的项目代码之前没有初始化
options值，导致现在在页面构建，接口返回数据前，options传入undefined时报错，导致页面崩溃。请衡量是否需要在组件中增加这个判断。
📝 Changelog
☑️ Self Check before Merge