[Bug] markPoint.label.rich设置富文本的宽度后出现空指针异常

### Version

5.6.0

### Link to Minimal Reproduction

https://jsbin.com/?html

### Steps to Reproduce

markPoint：{
label: {
show: true,
padding,
borderRadius: 4,
backgroundColor: '#fff',
shadowBlur: 5,
overflow: 'breakAll',
shadowColor: 'rgba(0, 0, 0, 0.1)',
shadowOffsetX: 2,
formatter: param => {
const { labelData } = param.data;
const labelContent = labelData.reduce((prev, cur) => {
return `${prev}\n${cur}`;
});
return `{text|${labelContent}}`;
},
rich: {
text: {
color: isDark ? '#eeeeee' : '#333',
fontSize: 14,
lineHeight,
width: 10,
},
},
},
}

>

### Current Behavior

--采用之前的markpoint配置，当label中的富文本配置了宽度，且Label的文本里应用了该富文本，当Label的文本足够长需要换行的时候可以复现该问题

### Expected Behavior

期望设置了富文本宽度当文本过长后能正常换行无任何报错

### Environment

```markdown
- OS:window
- Browser: Chrome
- Framework:React
```

### Any additional comments?

_No response_