fix(module: form): exception during validation for some nullable types

[ElderJames]

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🔗 Related issue link

fixed #4134

💡 Background and solution

📝 Changelog

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🇨🇳 Chinese

☑️ Self Check before Merge

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[github-actions]

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 43.24%. Comparing base (4ad8e7c) to head (230dca0).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...Validate/ValidationAttribute/NumberMaxAttribute.cs	0.00%	1 Missing and 1 partial ⚠️
...Validate/ValidationAttribute/NumberMinAttribute.cs	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4137       +/-   ##
===========================================
+ Coverage    1.41%   43.24%   +41.83%     
===========================================
  Files         583      583               
  Lines       29703    29771       +68     
  Branches     5868     5894       +26     
===========================================
+ Hits          419    12874    +12455     
+ Misses      29244    15823    -13421     
- Partials       40     1074     +1034     

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