Remove empty dir after cubids purge

[tien-tong]

Closes #494.

Changes proposed in this pull request

Documentation that should be reviewed

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.25%. Comparing base (fb4a253) to head (faca4cd).

Files with missing lines	Patch %	Lines
cubids/cubids.py	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #495      +/-   ##
==========================================
+ Coverage   72.67%   73.25%   +0.57%     
==========================================
  Files          10       10              
  Lines        2163     2176      +13     
  Branches      466      469       +3     
==========================================
+ Hits         1572     1594      +22     
+ Misses        423      416       -7     
+ Partials      168      166       -2     

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