Add test case for empty document not being read correctly

[HeavyWombat]

Ref: #16

Bump ytbx to get fix for empty document parsing issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.83%. Comparing base (92728a8) to head (5ce623c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #623   +/-   ##
=======================================
  Coverage   82.83%   82.83%           
=======================================
  Files          16       16           
  Lines        1823     1823           
=======================================
  Hits         1510     1510           
  Misses        236      236           
  Partials       77       77           

Flag	Coverage Δ
unittests	82.83% <ø> (ø)

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