[PBCKP-564] Don't spam with "skip empty file" message

[funny-falcon]

And don't add empty files to file list at all.

Fixes #35

[codecov]

Codecov Report

Merging #36 (33d249f) into master (42ea77d) will decrease coverage by 0.35%.
The diff coverage is 42.85%.

❗ Current head 33d249f differs from pull request most recent head 528c9db. Consider uploading reports for the commit 528c9db to get more accurate results

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   82.71%   82.36%   -0.35%     
==========================================
  Files           2        2              
  Lines         428      431       +3     
==========================================
+ Hits          354      355       +1     
- Misses         74       76       +2     

Impacted Files	Coverage Δ
ptrack.c	82.66% <42.85%> (-0.67%)	⬇️

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