Fix #243

[GUIpsp]

--manifest-path Cargo.toml is not equivalent to not passing the argument if it's a virtual workspace

[GUIpsp]

@AJIOB Since you implemented the related feature, could you check this does not break your workflows?

[macisamuele]

Fixes #243

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (2615a6c) to head (06e3eb1). Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #263   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          371       373    +2     
=========================================
+ Hits           371       373    +2     

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