fix empty clenshaw

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.04%. Comparing base (0cb2062) to head (dda3545).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   54.04%   54.04%           
=======================================
  Files           3        3           
  Lines         272      272           
=======================================
  Hits          147      147           
  Misses        125      125           

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