fix: handle empty files

[alexander-akait]

Summary

Handle empty files too

fixes #642

What kind of change does this PR introduce?

bugfix

Did you add tests for your changes?

Yes

Does this PR introduce a breaking change?

No

If relevant, what needs to be documented once your changes are merged or what have you already documented?

Nothing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.68%. Comparing base (f337cee) to head (b09572f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #643   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
=======================================
  Files           3        3           
  Lines         332      332           
  Branches      122      122           
=======================================
  Hits          321      321           
  Misses         11       11           

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