Fix error handling of list&revoke user

[touilleMan]

No description provided.

[touilleMan]

@Max-7 tu peux me revalider ça vite fait stp

[codecov]

Codecov Report

Merging #834 into master will decrease coverage by 12.26%.
The diff coverage is 7.69%.

@@             Coverage Diff             @@
##           master     #834       +/-   ##
===========================================
- Coverage    80.1%   67.83%   -12.27%     
===========================================
  Files         263      221       -42     
  Lines       21661    16885     -4776     
===========================================
- Hits        17351    11454     -5897     
- Misses       4310     5431     +1121

Impacted Files	Coverage Δ
parsec/core/gui/users_widget.py	22.99% <7.69%> (-61.53%)	⬇️
parsec/core/mountpoint/winfsp_runner.py	0% <0%> (-94.34%)	⬇️
parsec/core/gui/register_device_dialog.py	15.97% <0%> (-73.62%)	⬇️
parsec/core/gui/register_user_dialog.py	16.1% <0%> (-71.82%)	⬇️
parsec/win32.py	0% <0%> (-68.43%)	⬇️
parsec/core/gui/password_change_dialog.py	30% <0%> (-67.5%)	⬇️
parsec/core/gui/login_widget.py	25.19% <0%> (-64.13%)	⬇️
parsec/core/gui/mount_widget.py	29.54% <0%> (-63.64%)	⬇️
parsec/core/gui/file_table.py	12.11% <0%> (-62.98%)	⬇️
parsec/core/gui/replace_dialog.py	37.5% <0%> (-62.5%)	⬇️
... and 89 more

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[touilleMan]

CI error not related (see #811)