D22908: avoid qml warnings when controlRoot is not set

[Nathaniel Graham]

ngraham added subscribers: mart, ngraham.
ngraham accepted this revision.
ngraham added reviewers: mart, Plasma.
ngraham added a comment.
This revision is now accepted and ready to land.


  @mart, does this look correct to you?

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

REVISION DETAIL
  https://phabricator.kde.org/D22908

To: dakon, ngraham, mart, #plasma
Cc: ngraham, mart, plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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