fix: do not ignore empty plural values

[vonovak]

Description

It's a corner case but I think the test case explains it

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Fixes # (issue)

Checklist

• I have read the CONTRIBUTING and CODE_OF_CONDUCT docs
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated
js-lingui	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 11, 2023 at 11:34PM (UTC)

[github-actions]

size-limit report 📦

Path	Size
./packages/core/build/esm/index.js	1.56 KB (0%)
./packages/detect-locale/build/esm/index.js	812 B (0%)
./packages/react/build/esm/index.js	1.79 KB (0%)
./packages/remote-loader/build/esm/index.js	7.25 KB (0%)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (32c7f91) 73.93% compared to head (4ced4a8) 73.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1504      +/-   ##
==========================================
+ Coverage   73.93%   73.98%   +0.05%     
==========================================
  Files          67       67              
  Lines        1872     1872              
  Branches      493      493              
==========================================
+ Hits         1384     1385       +1     
  Misses        383      383              
+ Partials      105      104       -1     

Impacted Files	Coverage Δ
packages/core/src/formats.ts	96.87% <100.00%> (+3.12%)	⬆️

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[timofei-iatsenko]

LGTM! Thanks for contribution

[andrii-bodnar]

@vonovak thank you!