fix: Table expandIcon should work

[zombieJ]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

fix #21154

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Table expandIcon not work when data do not have children.
🇨🇳 Chinese

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[tests-checker]

Could you please add tests to make sure this change works as expected?

[ant-design-bot]

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 0cb24d8:

Sandbox	Source
antd reproduction template	Configuration
great-williamson-t3ium	Issue #21154
intelligent-sunset-lw1bc	Issue #21154
naughty-einstein-d8tjy	Issue #21154

[codecov]

Codecov Report

Merging #21169 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #21169      +/-   ##
==========================================
+ Coverage   97.45%   97.45%   +<.01%     
==========================================
  Files         296      296              
  Lines        6911     6912       +1     
  Branches     1919     1918       -1     
==========================================
+ Hits         6735     6736       +1     
  Misses        176      176

Impacted Files	Coverage Δ
components/table/Table.tsx	96.66% <100%> (+0.02%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 074fa32...0cb24d8. Read the comment docs.