api: patch empty size

[mloubout]

Fix empty size (e.g disk function in pro)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.96%. Comparing base (1c40d72) to head (89fbd02).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2737   +/-   ##
=======================================
  Coverage   82.96%   82.96%           
=======================================
  Files         248      248           
  Lines       50126    50126           
  Branches     4415     4415           
=======================================
  Hits        41585    41585           
  Misses       7787     7787           
  Partials      754      754           

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.76% <0.00%> (ø)
pytest-gpu-nvc-nvidiaX	69.28% <0.00%> (ø)

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