fix(sector): fix a case in which the angle is NaN.

[plainheart]

In #870, we fixed the animation bug caused by the NaN value. But that only works in canvas renderer. In SVG renderer, the path can't be successfully built because of the NaN value.

The related test case is the same as #870, that is, the last test case in echarts/test/pie-animation.html

[plainheart]

BTW, I found another bug related to label & labelLine. It should be related to these three places.

1. https://github.com/apache/echarts/blob/release/src/chart/pie/labelLayout.ts#L395-L399
2. https://github.com/apache/echarts/blob/release/src/chart/pie/labelLayout.ts#L547
3. https://github.com/apache/echarts/blob/release/src/chart/pie/labelLayout.ts#L552-L555
4. https://github.com/apache/echarts/blob/release/src/chart/pie/labelLayout.ts#L564-L567

It didn't take into account the case in which the data becomes normal from NaN value.

Here is an online test case: https://codepen.io/plainheart/pen/ZEXNQVy

[pissang]

I think shape with NaN value should be not displayed. If we treat it same with 0. Border will still be drawn.

[plainheart]

@pissang You're right. Fixed.