Fix a bug in {% if %}

[LilyAcorn]

Getting the logic right when exceptions are involved continues to be tricky.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (7ae1f6c) to head (b743d42).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files          48       48           
  Lines        7958     7959    +1     
  Branches     2819     2814    -5     
=======================================
+ Hits         7861     7862    +1     
  Misses         61       61           
  Partials       36       36           

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