Addresses #617

[jbogaardt]

Adds special handling for unique case of single valuation vector and additional test based on user case. All other tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.18%. Comparing base (4eb1671) to head (b8eb1ca).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #618      +/-   ##
==========================================
+ Coverage   84.15%   84.18%   +0.02%     
==========================================
  Files          83       83              
  Lines        4802     4811       +9     
  Branches      604      607       +3     
==========================================
+ Hits         4041     4050       +9     
  Misses        550      550              
  Partials      211      211              

Flag	Coverage Δ
unittests	84.18% <100.00%> (+0.02%)	⬆️

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