D12822: Added null check in OverlayDrawer

[Antonio Davide Trogu]

Dax created this revision.
Restricted Application added a project: Kirigami.
Restricted Application added a subscriber: plasma-devel.
Dax requested review of this revision.

REVISION SUMMARY
  This patch checks if 'header' property is valid
  
  Tested with Qt 5.10.1 on Android

REPOSITORY
  R169 Kirigami

REVISION DETAIL
  https://phabricator.kde.org/D12822

AFFECTED FILES
  src/controls/templates/OverlayDrawer.qml

To: Dax
Cc: plasma-devel, apol, davidedmundson, mart, hein
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