Error msg for termination status not covered

[guimarqu]

fix #175

[codecov-io]

Codecov Report

Merging #209 into master will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   85.61%   85.58%   -0.03%     
==========================================
  Files          39       39              
  Lines        2391     2394       +3     
==========================================
+ Hits         2047     2049       +2     
- Misses        344      345       +1

Impacted Files	Coverage Δ
src/optimizerwrappers.jl	92.77% <83.33%> (-0.98%)	⬇️

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