[AP1581] Don't crash target table when port_list is undefined (fix trashcan)

[swaterkamp]

What:
Don't crash the target table when target.port_list is undefined.

Why:
Seems like the trashcan doesn't provide the target's portlist and therefore breaks the target table

How:
Visual check if table cell is empty (no crash) and added automatic test.

Checklist:

• Tests
• CHANGELOG Entry
• Labels for ports to other branches

[codecov]

Codecov Report

Merging #3120 (a1cb610) into gsa-21.04 (8334006) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           gsa-21.04    #3120   +/-   ##
==========================================
  Coverage      58.34%   58.34%           
==========================================
  Files           1077     1077           
  Lines          26244    26246    +2     
  Branches        7516     7518    +2     
==========================================
+ Hits           15312    15314    +2     
  Misses          9908     9908           
  Partials        1024     1024           

Impacted Files	Coverage Δ
gsa/src/web/pages/targets/row.js	100.00% <100.00%> (ø)

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