Fix: Validation should ignore when a field is empty and is not required

[hwbrzzl]

📑 Description

Validation should ignore when a field is empty and is not required

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.03 ⚠️

Comparison is base (6c51c51) 62.02% compared to head (4b83bc8) 62.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #188      +/-   ##
==========================================
- Coverage   62.02%   62.00%   -0.03%     
==========================================
  Files         125      125              
  Lines        8051     8051              
==========================================
- Hits         4994     4992       -2     
- Misses       2729     2730       +1     
- Partials      328      329       +1     

Impacted Files	Coverage Δ
validation/validator.go	60.60% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[devhaozi]

LGTM