[PR #11857/0a915b8f backport][3.14] Fix multipart parsing for empty body parts

[patchback]

This is a backport of PR #11857 as merged into master (0a915b8).

Fixes multipart parser when encountering an empty body.

[codspeed-hq]

CodSpeed Performance Report

Merging #11880 will not alter performance

_{Comparing patchback/backports/3.14/0a915b8fb0fc02904b59ede9af8328b9ad305a1b/pr-11857 (0c1d048) with 3.14 (0c26d87)¹}

Summary

✅ 59 untouched

Footnotes

1. No successful run was found on 3.14 (90f7143) during the generation of this report, so 0c26d87 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.21%. Comparing base (0c26d87) to head (0c1d048).
⚠️ Report is 3 commits behind head on 3.14.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.14   #11880   +/-   ##
=======================================
  Coverage   98.20%   98.21%           
=======================================
  Files         128      128           
  Lines       44574    44590   +16     
  Branches     2411     2412    +1     
=======================================
+ Hits        43775    43794   +19     
+ Misses        616      613    -3     
  Partials      183      183           

Flag	Coverage Δ
CI-GHA	98.09% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.85% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.58% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.08% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.61% <100.00%> (+<0.01%)	⬆️
Py-3.10.19	97.11% <100.00%> (+<0.01%)	⬆️
Py-3.11.14	97.36% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.86% <100.00%> (+<0.01%)	⬆️
Py-3.12.10	96.94% <100.00%> (+<0.01%)	⬆️
Py-3.12.12	97.45% <100.00%> (+<0.01%)	⬆️
Py-3.13.11	97.67% <100.00%> (+<0.01%)	⬆️
Py-3.14.2	97.69% <100.00%> (+<0.01%)	⬆️
Py-3.14.2t	96.78% <100.00%> (+<0.01%)	⬆️
Py-pypy3.11.13-7.3.20	96.94% <100.00%> (+<0.01%)	⬆️
VM-macos	97.08% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.85% <100.00%> (+<0.01%)	⬆️
VM-windows	95.58% <100.00%> (+<0.01%)	⬆️

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