D27405: Hide group menu items if they have no children

[Aleksei Nikiforov]

alnikiforov added a comment.


  Here's screenshot of empty **Science** and **Development** groups being visible before this change is applied:
  
  F8103807: Screenshot_20200214_151125_1.png <https://phabricator.kde.org/F8103807>
  
  With this, they'd no longer be visible.

REPOSITORY
  R125 KHelpCenter

REVISION DETAIL
  https://phabricator.kde.org/D27405

To: alnikiforov, yurchor, mlaurent, ltoscano
Cc: kde-doc-english, gennad, fbampaloukas, skadinna
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