Fix PossibleClassicalForms

[fingolfin]

Remove an incorrect early abort in PossibleClassicalForms.

CC @aniemeyer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.47%. Comparing base (ff7de3a) to head (c2914fa).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   80.40%   80.47%   +0.06%     
==========================================
  Files           8        8              
  Lines        3670     3667       -3     
==========================================
  Hits         2951     2951              
+ Misses        719      716       -3     

Files with missing lines	Coverage Δ
lib/recognition.gi	45.45% <ø> (+0.29%)	⬆️

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[fingolfin]

Oops, my previous fix PR #88 is better 😓