Fix crash in ipc server when POSIX lock path contains missing folder

[touilleMan]

No description provided.

[codecov]

Codecov Report

Merging #760 into master will decrease coverage by <.01%.
The diff coverage is 71.42%.

@@            Coverage Diff            @@
##           master    #760      +/-   ##
=========================================
- Coverage    47.2%   47.2%   -0.01%     
=========================================
  Files         258     258              
  Lines       21299   21303       +4     
=========================================
+ Hits        10055   10056       +1     
- Misses      11244   11247       +3

Impacted Files	Coverage Δ
parsec/core/ipcinterface.py	87.59% <71.42%> (-0.38%)	⬇️
parsec/core/local_device/cipher.py	84.09% <0%> (-4.55%)	⬇️
parsec/core/local_device/utils.py	85.39% <0%> (-3.38%)	⬇️
parsec/core/fs/remote_loader.py	74.18% <0%> (-0.82%)	⬇️
parsec/core/sync_monitor.py	91.88% <0%> (-0.43%)	⬇️
parsec/core/remote_devices_manager.py	79.12% <0%> (+1.09%)	⬆️
parsec/backend/postgresql/block.py	90.14% <0%> (+1.4%)	⬆️
parsec/core/backend_connection/transport.py	92.48% <0%> (+1.5%)	⬆️
parsec/api/transport.py	90.98% <0%> (+1.63%)	⬆️

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