bugfix #15694: support connectNulls series in data zoom

[PIMBA]

Brief Information

This pull request is in the type of:

• [x] bug fixing
• [ ] new feature
• [ ] others

What does this PR do?

Add connectNulls: true support.

Fixed issues

#15694

Details

Before: What was the problem?

Data Zoom series has gaps while series "connectNulls" is true.

After: How does it behave after the fixing?

When series connectNulls is true, Data Zoom will connect NaN values to avoid gaps.

Document Info

One of the following should be checked.

• [ ] This PR doesn't relate to document changes
• [x] 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

test case

Others

Merging options

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

Other information

[echarts-bot[bot]]

Thanks for your contribution! The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.

[PIMBA]

All conversations resovled.

[jinder]

Can this be merged?