Fix test generation failing for NetworkPolicy ports without port value

[maxbischoff]

Closes #102

[codecov]

Codecov Report

Merging #120 into master will increase coverage by 17.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #120       +/-   ##
===========================================
+ Coverage   21.98%   39.02%   +17.03%     
===========================================
  Files           9       11        +2     
  Lines        1087     1330      +243     
  Branches      224      264       +40     
===========================================
+ Hits          239      519      +280     
+ Misses        831      763       -68     
- Partials       17       48       +31     

Impacted Files	Coverage Δ
src/illuminatio/test_case.py	80.95% <100.00%> (+44.02%)	⬆️
src/illuminatio/k8s_util.py	21.73% <0.00%> (ø)
src/illuminatio/illuminatio.py	0.00% <0.00%> (ø)
src/illuminatio/cleaner.py	0.00% <0.00%> (ø)
src/illuminatio/illuminatio_runner.py	27.91% <0.00%> (+9.13%)	⬆️
src/illuminatio/test_orchestrator.py	24.10% <0.00%> (+12.79%)	⬆️
src/illuminatio/rule.py	57.33% <0.00%> (+25.33%)	⬆️
src/illuminatio/host.py	64.39% <0.00%> (+29.54%)	⬆️
src/illuminatio/util.py	90.47% <0.00%> (+41.26%)	⬆️
... and 1 more

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[johscheuer]

LGTM, thanks!