fallback to empty string message "" when get nil value

[LemonNekoGH]

#325

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 73.86%. Comparing base (521f196) to head (1b3ae62).

Files	Patch %	Lines
i18n/parse.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   73.93%   73.86%   -0.08%     
==========================================
  Files          20       20              
  Lines        1995     2001       +6     
==========================================
+ Hits         1475     1478       +3     
- Misses        454      456       +2     
- Partials       66       67       +1     

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