Fix invite email in backend when not mocked

[touilleMan]

No description provided.

[codecov]

Codecov Report

Merging #1410 into master will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1410      +/-   ##
==========================================
+ Coverage   87.31%   87.33%   +0.01%     
==========================================
  Files         247      247              
  Lines       23065    23065              
==========================================
+ Hits        20140    20144       +4     
+ Misses       2925     2921       -4     

Impacted Files	Coverage Δ
parsec/backend/cli/run.py	68.96% <ø> (ø)
parsec/backend/invite.py	89.21% <0.00%> (ø)
parsec/core/gui/trio_thread.py	90.55% <0.00%> (-1.12%)	⬇️
parsec/core/gui/files_widget.py	76.25% <0.00%> (-0.72%)	⬇️
parsec/core/gui/main_window.py	71.02% <0.00%> (-0.44%)	⬇️
parsec/core/gui/greet_user_widget.py	86.04% <0.00%> (-0.20%)	⬇️
parsec/core/fs/workspacefs/workspacefs.py	97.53% <0.00%> (+0.30%)	⬆️
parsec/core/sync_monitor.py	95.61% <0.00%> (+0.39%)	⬆️
parsec/core/fs/userfs/userfs.py	87.28% <0.00%> (+0.43%)	⬆️
parsec/core/gui/workspaces_widget.py	77.77% <0.00%> (+0.46%)	⬆️
... and 4 more

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