D16945: Fix fallback to built-in ui

[Martin Flöser]

graesslin created this revision.
graesslin added a reviewer: Plasma.
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REVISION SUMMARY
  If the lock screen package is not available m_mainQmlPath is an empty
  URL. Thus view->setSource won't do anything and the status won't change
  to Error. Due to that the fallback was not activated when the lnf
  package is missing.
  
  This change also checks whether said variable is empty.

TEST PLAN
  run kscreenlocker_greet in testing mode with manipulated XDG_DATA_DIRS

REPOSITORY
  R133 KScreenLocker

BRANCH
  fix-fallback

REVISION DETAIL
  https://phabricator.kde.org/D16945

AFFECTED FILES
  greeter/greeterapp.cpp

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