[FIX] add more explicit error message for input parsing of getData

[Remi-Gau]

fixes #724

[codecov]

Codecov Report

Merging #726 (7e3f24f) into main (5795c33) will decrease coverage by 0.05%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #726      +/-   ##
==========================================
- Coverage   76.21%   76.16%   -0.06%     
==========================================
  Files         214      214              
  Lines        5513     5514       +1     
==========================================
- Hits         4202     4200       -2     
- Misses       1311     1314       +3     

Flag	Coverage Δ
unittests	76.16% <87.50%> (?)

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Impacted Files	Coverage Δ
src/IO/getData.m	93.93% <87.50%> (-2.36%)	⬇️
src/subject_level/convertOnsetTsvToMat.m	90.54% <0.00%> (-3.14%)	⬇️

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