singular exception issue

[matbesancon]

This test confirms that #65 is solved

[codecov]

Codecov Report

Merging #78 (c3fa828) into master (5eceaaf) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   87.68%   87.71%   +0.02%     
==========================================
  Files           4        4              
  Lines         414      415       +1     
==========================================
+ Hits          363      364       +1     
  Misses         51       51              

Impacted Files	Coverage Δ
src/MOI_wrapper.jl	86.13% <0.00%> (+0.05%)	⬆️

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