bug: Print csl namehint fix

[n-io]

Print via _use_var instead of name_hint, as that can be None.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.04%. Comparing base (5d9837e) to head (95b33cf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3207   +/-   ##
=======================================
  Coverage   90.04%   90.04%           
=======================================
  Files         432      432           
  Lines       54454    54454           
  Branches     8448     8448           
=======================================
  Hits        49031    49031           
  Misses       4056     4056           
  Partials     1367     1367           

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[dk949]

Looks good AFAICT