[FIX] exit with a warning and not an error when no constrast specified

[Remi-Gau]

No description provided.

[codecov]

Codecov Report

Merging #870 (afbc25c) into main (9b5e2c4) will increase coverage by 1.51%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
+ Coverage   78.77%   80.28%   +1.51%     
==========================================
  Files         238      233       -5     
  Lines        6361     6123     -238     
  Branches       37        0      -37     
==========================================
- Hits         5011     4916      -95     
+ Misses       1335     1207     -128     
+ Partials       15        0      -15     

Flag	Coverage Δ
cli	?
matlab	80.10% <100.00%> (+<0.01%)	⬆️
octave	78.76% <100.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
src/stats/subject_level/specifyContrasts.m	76.47% <100.00%> (+0.35%)	⬆️
src/parsers.py
src/bidspm.py
src/__init__.py
src/matlab.py
src/validate.py

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