Delay null file handle closure until after post-processing

[godotalgorithm]

Fixes #226.

Status

• Ready for merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.98%. Comparing base (c92b082) to head (cd9b9aa).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   67.98%   67.98%           
=======================================
  Files         339      339           
  Lines       77435    77435           
=======================================
+ Hits        52646    52648    +2     
+ Misses      24789    24787    -2     

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