error when invalid status

[matbesancon]

Closes #171

[codecov]

Codecov Report

Merging #212 (864a6af) into master (57f01d1) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   89.39%   89.42%   +0.03%     
==========================================
  Files           8        8              
  Lines         839      842       +3     
==========================================
+ Hits          750      753       +3     
  Misses         89       89              

Impacted Files	Coverage Δ
src/diff_opt.jl	99.21% <ø> (ø)
src/moi_wrapper.jl	85.39% <100.00%> (+0.16%)	⬆️

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