D7467: Check item validity before using it

[Dan Leinir Turthra Jensen]

leinir created this revision.
leinir added a project: Kirigami.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  itemAt isn't guaranteed to always return an item, so check the validity of that first before trying to do things with it.

REPOSITORY
  R169 Kirigami

REVISION DETAIL
  https://phabricator.kde.org/D7467

AFFECTED FILES
  src/controls/templates/OverlayDrawer.qml

To: leinir, #kirigami, mart
Cc: plasma-devel, apol, mart
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