fix: couldn't find interpreter for global project

[frostming]

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Fix #2726

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 85.07%. Comparing base (6779fbd) to head (43ebe89).

Files	Patch %	Lines
src/pdm/project/core.py	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2727   +/-   ##
=======================================
  Coverage   85.07%   85.07%           
=======================================
  Files         106      106           
  Lines       10539    10539           
  Branches     2288     2288           
=======================================
  Hits         8966     8966           
  Misses       1101     1101           
  Partials      472      472           

Flag	Coverage Δ
unittests	84.85% <50.00%> (ø)

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