fix(pie): fix percent isn't updated after the legend is changed

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fix bugs brought in #17275.

• The percent has wrong values after the legend is changed
• The percent gets undefined value when all data are 0.

Fixed issues

• [Bug] 5.4.0饼图切换示例计算百分比有误 #17732

Comparison

-	Case A	Case B
Before
After

Document Info

One of the following should be checked.

• This PR doesn't relate to document changes
• The document should be updated later
• The document changes have been made in apache/echarts-doc#xxx

Misc

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

Please refer to test/pie-percent.html

Others

Merging options

• Please squash the commits into a single one when merging.

Other information

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[echarts-bot]

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