D4926: Fix cmake warning

[Aleix Pol Gonzalez]

apol created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Use the native dialog if there's no QApplication

TEST PLAN
  Adds a test

REPOSITORY
  R135 Integration for Qt applications in Plasma

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D4926

AFFECTED FILES
  autotests/CMakeLists.txt
  autotests/tst_filedialog.qml
  src/platformtheme/CMakeLists.txt
  src/platformtheme/kdeplatformtheme.cpp

To: apol, #frameworks
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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