fix(lines): fix NPE issue when lines series has no coordinate system.

[plainheart]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Fixes #14991 - The lines chart doesn't work and throws the following errors when it has no coordinate system.

TypeError: Cannot read properties of undefined (reading 'dataToPoint')

Fixed issues

• Uncaught TypeError: Cannot read property 'dataToPoint' of undefined #14991

Details

Before: What was the problem?

After: How is it fixed in this PR?

Misc

• The API has been changed (apache/echarts-doc#xxx).
• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

Please refer to test/lines-graph.html

Others

Merging options

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

Other information

[echarts-bot]

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[pissang]

Will it be better to give an error message that lines series must have a coordinate system?

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍