[frontend] fix default value displayed in case of windows registry key (#5387)

[lndrtrbn]

Proposed changes

• manage the case of windows registry key when retrieving displayable value

Related issues

• Default value of a Registry Key is not properly shown in Workbench #5387

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6050df4) 66.24% compared to head (7f81e46) 66.24%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5496   +/-   ##
=======================================
  Coverage   66.24%   66.24%           
=======================================
  Files         508      508           
  Lines       59807    59807           
  Branches     4365     4365           
=======================================
+ Hits        39619    39620    +1     
+ Misses      20188    20187    -1     

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