D19029: Guard virtualDesktopManagement being accessed before fetched

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  The WaylandPrivate::virtualDesktopManagement object is loaded
  asyncronously.
  
  It's null until we finish fetching the registry.
  
  A code path could call the desktopNames in that time.

TEST PLAN
  Had a crash
  Couldn't reproduce reliably

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19029

AFFECTED FILES
  libtaskmanager/virtualdesktopinfo.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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