Fix missing space in ValueError message

[veeceey]

Summary

Fix missing space in the ValueError message raised by _parse_args() -- the implicit string concatenation between the two f-strings was missing a trailing space, producing "element #0has" instead of "element #0 has".

Test plan

• Verified the corrected message output manually

[codspeed-hq]

Merging this PR will not alter performance

✅ 245 untouched benchmarks

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_{Comparing veeceey:fix/error-message-missing-space (707c8ca) with master (dbebab0)}

[webknjaz]

Alright.. Please add a regression test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.85%. Comparing base (8416839) to head (707c8ca).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files          26       26           
  Lines        3513     3513           
  Branches      253      253           
=======================================
  Hits         3508     3508           
  Misses          3        3           
  Partials        2        2           

Flag	Coverage Δ
CI-GHA	99.85% <100.00%> (ø)
pytest	99.85% <100.00%> (ø)

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[webknjaz]

No need to duplicate an existing test. Just update it.

[Vizonex]

Looks good no complaints from me.

[veeceey]

Done -- updated the existing test_cannot_create_from_unaccepted to check the full message spacing instead of adding a separate test.

[veeceey]

Hi @webknjaz, I updated the existing test as you suggested instead of duplicating it — the test_cannot_create_from_unaccepted test now checks the full message including the spacing fix. Happy to adjust if you'd prefer a different approach.