fix: the computed fontSize style may be empty string

[zheeeng]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

一些元素的 fontSize 计算结果是 ''，导致 parseInt 算出来是 NaN

📝 Changelog

Language	Changelog
🇺🇸 English	fix the cases that the computed fontSize style be calculated as empty string
🇨🇳 Chinese	修复一些元素计算 fontSize 时为空字符串的情况

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• 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

[github-actions]

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (f954ab1) compared to base (44eb250).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head f954ab1 differs from pull request most recent head 709df8a. Consider uploading reports for the commit 709df8a to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #37928   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          443       443           
  Lines         8254      8254           
  Branches      2488      2489    +1     
=========================================
  Hits          8254      8254           

Impacted Files	Coverage Δ
components/typography/Base/index.tsx	100.00% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.