Remove _EmptyIO

[DanielNoord]

Let's try #2593 again, this time with a guard around .truncate()

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (39227b7) to head (fed6c0c).
⚠️ Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2601      +/-   ##
==========================================
+ Coverage   99.30%   99.42%   +0.12%     
==========================================
  Files          41       41              
  Lines        3150     3149       -1     
  Branches      680      682       +2     
==========================================
+ Hits         3128     3131       +3     
+ Misses         14       11       -3     
+ Partials        8        7       -1     

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