Fix panic on missing file.

[aalexand]

Fixes #863.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.98%. Comparing base (0ed6a68) to head (879efe7).
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #864      +/-   ##
==========================================
+ Coverage   66.86%   66.98%   +0.11%     
==========================================
  Files          44       44              
  Lines        9824     9793      -31     
==========================================
- Hits         6569     6560       -9     
+ Misses       2794     2780      -14     
+ Partials      461      453       -8     

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[cuishuang]

Thanks for the fix.