[ENH] add warning keepHemipshere in case of creating empty roi

[Remi-Gau]

No description provided.

[codecov]

Codecov Report

Merging #54 (52704ab) into dev (85197b9) will decrease coverage by 0.15%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##              dev      #54      +/-   ##
==========================================
- Coverage   89.76%   89.61%   -0.16%     
==========================================
  Files          23       23              
  Lines         518      520       +2     
==========================================
+ Hits          465      466       +1     
- Misses         53       54       +1     

Flag	Coverage Δ
unittests	89.61% <50.00%> (-0.16%)	⬇️

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Impacted Files	Coverage Δ
src/roi/keepHemisphere.m	89.47% <50.00%> (-4.65%)	⬇️

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