factory is only added to dropdown list if its portlets are not empty

[simonsymhoven]

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your master branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[codecov]

Codecov Report

Merging #86 (2aa9df0) into master (56b687d) will not change coverage.
The diff coverage is n/a.

❗ Current head 2aa9df0 differs from pull request most recent head 081e73e. Consider uploading reports for the commit 081e73e to get more accurate results

@@            Coverage Diff            @@
##             master      #86   +/-   ##
=========================================
  Coverage     79.26%   79.26%           
+ Complexity        9        8    -1     
=========================================
  Files             2        1    -1     
  Lines            82       82           
  Branches          7        7           
=========================================
  Hits             65       65           
  Misses           14       14           
  Partials          3        3           

Impacted Files	Coverage Δ
...ins/plugins/monitoring/util/PullRequestFinder.java
...in/java/io/jenkins/plugins/monitoring/Monitor.java	79.26% <0.00%> (+0.78%)	⬆️

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