Report missing file name as "", not "."

[ghemawat]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.42%. Comparing base (0ed6a68) to head (d3c3427).
Report is 40 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
+ Coverage   66.86%   67.42%   +0.56%     
==========================================
  Files          44       44              
  Lines        9824     9855      +31     
==========================================
+ Hits         6569     6645      +76     
+ Misses       2794     2762      -32     
+ Partials      461      448      -13     

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[aalexand]

thanks