Simplify read_mo logic regarding catalog.charset

[tomasr8]

Catalog.charset is set to utf-8 when no charset is provided (which is the case here) so the if check is redundant.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.27%. Comparing base (f1c8633) to head (1e648b5).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1148      +/-   ##
==========================================
- Coverage   91.31%   91.27%   -0.04%     
==========================================
  Files          27       27              
  Lines        4618     4621       +3     
==========================================
+ Hits         4217     4218       +1     
- Misses        401      403       +2     

Flag	Coverage Δ
macos-12-3.10	90.04% <100.00%> (-0.04%)	⬇️
macos-12-3.11	89.98% <100.00%> (-0.04%)	⬇️
macos-12-3.12	90.19% <100.00%> (-0.04%)	⬇️
macos-12-3.13-dev	89.72% <100.00%> (-0.04%)	⬇️
macos-12-3.8	89.97% <100.00%> (-0.04%)	⬇️
macos-12-3.9	89.97% <100.00%> (-0.04%)	⬇️
macos-12-pypy3.10	90.04% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.10	90.06% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.11	90.00% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.12	90.21% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.13-dev	89.74% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.8	89.99% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-3.9	89.99% <100.00%> (-0.04%)	⬇️
ubuntu-22.04-pypy3.10	90.06% <100.00%> (-0.04%)	⬇️
windows-2022-3.10	90.18% <100.00%> (-0.04%)	⬇️
windows-2022-3.11	90.12% <100.00%> (-0.04%)	⬇️
windows-2022-3.12	90.33% <100.00%> (-0.04%)	⬇️
windows-2022-3.13-dev	89.86% <100.00%> (-0.04%)	⬇️
windows-2022-3.8	90.11% <100.00%> (-0.04%)	⬇️
windows-2022-3.9	90.11% <100.00%> (-0.04%)	⬇️
windows-2022-pypy3.10	90.18% <100.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.