Modify BackendAddr.from_url to refuse url with no hostname part inste…

[touilleMan]

…ad of defaulting to localhost

[codecov]

Codecov Report

Merging #1402 into master will decrease coverage by 19.19%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #1402       +/-   ##
===========================================
- Coverage   87.04%   67.84%   -19.20%     
===========================================
  Files         247      247               
  Lines       23014    23016        +2     
===========================================
- Hits        20033    15616     -4417     
- Misses       2981     7400     +4419     

Impacted Files	Coverage Δ
parsec/core/types/backend_address.py	91.76% <100.00%> (-2.53%)	⬇️
parsec/core/mountpoint/winfsp_operations.py	0.00% <0.00%> (-95.17%)	⬇️
parsec/core/mountpoint/winfsp_runner.py	0.00% <0.00%> (-90.91%)	⬇️
parsec/core/mountpoint/winify.py	17.24% <0.00%> (-79.32%)	⬇️
parsec/core/gui/claim_device_widget.py	19.47% <0.00%> (-68.81%)	⬇️
parsec/win32.py	0.00% <0.00%> (-68.43%)	⬇️
parsec/core/gui/claim_user_widget.py	19.38% <0.00%> (-67.93%)	⬇️
parsec/core/gui/central_widget.py	17.22% <0.00%> (-67.78%)	⬇️
parsec/core/gui/greet_user_widget.py	18.79% <0.00%> (-67.45%)	⬇️
parsec/core/gui/create_org_widget.py	21.07% <0.00%> (-64.71%)	⬇️
... and 56 more

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