Allow Chalmet to return solutions on error

[odow]

Part of #141

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.74%. Comparing base (f793c76) to head (b38fee3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #143   +/-   ##
=======================================
  Coverage   98.74%   98.74%           
=======================================
  Files          12       12           
  Lines        1113     1113           
=======================================
  Hits         1099     1099           
  Misses         14       14           

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