Fix formatting for "Empty locale identifier" exception added in #1164

[akx]

Refs #1183.

Before

$ env LANG= LC_TIME= uvx --from=babel==2.17.0 --python=3.13 python ~/Desktop/reproducer.py
[...]
TypeError: ("Empty locale identifier value: None\n\nIf you didn't explicitly pass an empty value to a Babel function, this could be caused by there being no suitable locale environment variables for the API you tried to use.",)

After

$ env LANG= LC_TIME= python ~/Desktop/reproducer.py
[...]
TypeError: Empty locale identifier value: None

If you didn't explicitly pass an empty value to a Babel function, this could be caused by there being no suitable locale environment variables for the API you tried to use.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.68%. Comparing base (b50a1d2) to head (14d625b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1184   +/-   ##
=======================================
  Coverage   91.68%   91.68%           
=======================================
  Files          27       27           
  Lines        4689     4689           
=======================================
  Hits         4299     4299           
  Misses        390      390           

Flag	Coverage Δ
macos-14-3.10	90.72% <ø> (ø)
macos-14-3.11	90.65% <ø> (ø)
macos-14-3.12	90.87% <ø> (ø)
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macos-14-3.8	90.58% <ø> (ø)
macos-14-3.9	90.65% <ø> (ø)
macos-14-pypy3.10	90.72% <ø> (ø)
ubuntu-24.04-3.10	90.74% <ø> (ø)
ubuntu-24.04-3.11	90.68% <ø> (ø)
ubuntu-24.04-3.12	90.89% <ø> (ø)
ubuntu-24.04-3.13	90.89% <ø> (ø)
ubuntu-24.04-3.8	90.61% <ø> (ø)
ubuntu-24.04-3.9	90.67% <ø> (ø)
ubuntu-24.04-pypy3.10	90.74% <ø> (ø)
windows-2022-3.10	90.73% <ø> (ø)
windows-2022-3.11	90.67% <ø> (ø)
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windows-2022-3.13	90.88% <ø> (ø)
windows-2022-3.8	90.70% <ø> (ø)
windows-2022-3.9	90.66% <ø> (ø)
windows-2022-pypy3.10	90.73% <ø> (ø)

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