fix: add null check of arrowRef.current

[zerosrat]

When evaluating arrowRef.current.offsetLeft, maybe arrowRef.current is null. As a result it throws undefined is not an object error.

So I add a null check before.

@zombieJ

close ant-design/ant-design#42849

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Name	Status	Preview	Comments	Updated (UTC)
picker	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 1, 2023 0:34am

[zombieJ]

加个 测试？

[codecov]

Codecov Report

Merging #644 (d726704) into master (2412675) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head d726704 differs from pull request most recent head 4e19bc8. Consider uploading reports for the commit 4e19bc8 to get more accurate results

@@           Coverage Diff           @@
##           master     #644   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          52       52           
  Lines        2397     2398    +1     
  Branches      705      718   +13     
=======================================
+ Hits         2378     2379    +1     
  Misses         17       17           
  Partials        2        2           

Impacted Files	Coverage Δ
src/RangePicker.tsx	99.27% <100.00%> (+<0.01%)	⬆️

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[zerosrat]

加个 测试？

当 arrowRef.current 为空的时候，就不计算 arrowLeft 和 panelLeft，会影响样式。
如果要写测试的话，是测试什么 case 哇？

[zombieJ]

看起来是没啥测试的必要

[zombieJ]

+ [email protected]