[JENKINS-71435] Make empty properties clickable

[debayangg]

Fixes JENKINS-71435. Changed formatProperty() method in DetailsTableModel.java to display issues with blank categories as '-' category.

Before change:

After change:

Testing done

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6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (018c572) 81.82% compared to head (759fd66) 81.83%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1648      +/-   ##
============================================
+ Coverage     81.82%   81.83%   +0.01%     
  Complexity     1411     1411              
============================================
  Files           249      249              
  Lines          5358     5361       +3     
  Branches        398      399       +1     
============================================
+ Hits           4384     4387       +3     
  Misses          861      861              
  Partials        113      113              

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[uhafner]

Can you please also add a small unit test in DetailsTableModelTest?

[debayangg]

I will be travelling for a few days so it might take a bit of time to add the unit tests.