[FIX] remove dummies from preproc and not raw when using cli

[Remi-Gau]

fixes #1033

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.60%. Comparing base (8d8a32d) to head (d604739).
Report is 180 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1057      +/-   ##
==========================================
- Coverage   79.61%   79.60%   -0.02%     
==========================================
  Files         246      246              
  Lines        6702     6703       +1     
  Branches       40       40              
==========================================
  Hits         5336     5336              
- Misses       1350     1351       +1     
  Partials       16       16              

Flag	Coverage Δ
cli	38.99% <ø> (ø)
macos-latest_matlab-R2022b	80.85% <100.00%> (-0.02%)	⬇️
octave	76.72% <100.00%> (-0.06%)	⬇️
ubuntu-latest_matlab-R2022b	81.02% <100.00%> (-0.02%)	⬇️

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