D27405: Hide group menu items if they have no children

[Aleksei Nikiforov]

alnikiforov created this revision.
alnikiforov added reviewers: yurchor, mlaurent, ltoscano.
Herald added a project: Documentation.
Herald added a subscriber: kde-doc-english.
alnikiforov requested review of this revision.

REVISION SUMMARY
  If there's no data, it looks like it's bugged. Let's hide it in such case.
  
  Similar to: D27403 <https://phabricator.kde.org/D27403>, D27404 <https://phabricator.kde.org/D27404>

TEST PLAN
  Before testing this bug, it may be necessary to remove some applications to reproduce situation when only applications with no documentation are present in a menu group.
  On my test machine, I have only 'LibreOffice Math' in 'Science' group, and around 4 applications in 'Development' group, and none of these applications have information about
  documentation present at all or in way that khelpcenter can detect and process.
  
  Thus, when I open menu item **Application Manuals** -> **Science** or **Development**, it is completely empty.
  
  With this change all such empty items should be hidden instead.

REPOSITORY
  R125 KHelpCenter

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

AFFECTED FILES
  khelpcenter/navigatorappgroupitem.cpp

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