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### One-line summary [问题简述]
雷达图中的数据是 ["-", 5, 8, 1, 4]，其中“-”处于第一位和中间位置时表现不一致，当“-”处于数组第一位时，tooltip消失后连线消失了。
### Version & Environment [版本及环境]
+ v4.1.0 [ECharts 版本]:
+ Chrome [浏览器类型和版本]:
+ Win8.1 [操作系统类型和版本]:
### Expected behaviour [期望结果]
当雷达图中系列的数据是'-'时，相邻的两个点可以连线，而且当‘-’处于数组中的第一位时，将鼠标放置到某个点时tooltip消失后连线不消失。
### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
option = {
"animation": false,
"backgroundColor": "rgba(255,255,255,1)",
"tooltip": {
"trigger": "item"
},
"title": null,
"legend": {
"show": true,
"left": "right",
"top": "center",
"orient": "vertical",
"align": "left",
"backgroundColor": "rgba(255,255,255,0)",
"borderColor": "rgba(255,255,255,0)",
"borderWidth": 1,
"textStyle": {
"color": "rgba(0,0,0,1)",
"fontFamily": "'MS PGothic'",
"fontSize": 14.67,
"fontStyle": "Normal",
"fontWeight": 400
},
"data": [{
"name": "整数",
"icon": "roundRect"
}],
"itemWidth": 14,
"itemGap": 12
},
"series": [{
"type": "radar",
"name": "整数",
"data": [{
"value": ["-", 5, 8, 1, 4]
}],
"label": {
"show": false,
"position": "outside",
"color": "rgba(0,0,0,1)",
"fontFamily": "'MS PGothic'",
"fontSize": 14.67,
"fontStyle": "Normal",
"fontWeight": 400
},
"itemStyle": {
"color": "rgba(79,129,189,1)"
},
"lineStyle": {
"color": "rgba(79,129,189,1)",
"width": 1,
"type": "solid"
},
"symbol": "diamond",
"symbolSize": 7
}],
"radar": {
"splitNumber": 9,
"indicator": [{
"name": "AronChen",
"max": 9,
"min": 0
}, {
"name": "Administrator",
"max": 9,
"min": 0
}, {
"name": "AngelaLi",
"max": 9,
"min": 0
}, {
"name": "AndrewLiang",
"max": 9,
"min": 0
}, {
"name": "AmandaDuan",
"max": 9,
"min": 0
}],
"name": {
"show": true,
"textStyle": {
"color": "rgba(0,0,0,1)",
"fontFamily": "'MS PGothic'",
"fontSize": 14.67,
"fontStyle": "Normal",
"fontWeight": 400
}
},
"axisLine": {
"show": true,
"lineStyle": {
"color": "rgba(0,0,0,1)",
"type": "solid",
"width": 1
}
},
"axisTick": {
"show": false,
"inside": false,
"length": 7,
"lineStyle": {
"color": "rgba(134,134,134,1)",
"width": 0.5
}
},
"splitLine": {
"show": true,
"lineStyle": {
"color": "rgba(134,134,134,1)",
"width": 0.5,
"type": "solid"
}
},
"splitArea": {
"show": true,
"areaStyle": {
"color": "rgba(255,255,255,1)"
}
},
"startAngle": 162,
"center": [204.5, 145],
"radius": 91.125
}
}
### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如，截图或线上实例 (JSFiddle/JSBin/Codepen)] -->
[ Full content available at:
https://github.com/apache/incubator-echarts/issues/8962 ]
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