swiper bug: Cannot read property 'paused' of undefined

**问题描述**

源代码报错
this.swiper.autoplay是undefind了

**复现步骤**


```js
// 这里可以贴代码
```

**期望行为**

**报错信息**

**系统信息**

**补充信息**

Start by locating the swiper component and the code path that accesses this.swiper.autoplay, then reproduce the reported error using the screenshot and issue description. Confirm which platform and package versions are involved before changing anything; done means the swiper no longer reads paused from an undefined autoplay object and the regression is covered by an appropriate test.

Written by the indexing model from the issue text.