fix: correct item count and size for empty dirs

[dundee]

fixes #571

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.65%. Comparing base (27df461) to head (fb32fe6).

Files with missing lines	Patch %	Lines
report/export.go	25.00%	1 Missing and 2 partials ⚠️
stdout/stdout.go	76.92%	1 Missing and 2 partials ⚠️
tui/actions.go	25.00%	1 Missing and 2 partials ⚠️
pkg/analyze/file.go	91.66%	2 Missing ⚠️
pkg/analyze/stored.go	90.90%	2 Missing ⚠️
pkg/analyze/top_dir.go	86.66%	2 Missing ⚠️
pkg/analyze/sqlite.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #574      +/-   ##
==========================================
- Coverage   85.80%   85.65%   -0.15%     
==========================================
  Files          55       55              
  Lines        5965     6011      +46     
==========================================
+ Hits         5118     5149      +31     
- Misses        654      663       +9     
- Partials      193      199       +6     

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