D16375: fix warnings

[Aleix Pol Gonzalez]

apol created this revision.
apol added reviewers: Kirigami, mart.
Herald added a project: Kirigami.
Herald added a subscriber: plasma-devel.
apol requested review of this revision.

REVISION SUMMARY
  Don't call directly properties that may be undefined

TEST PLAN
  Now discover still works without warnings in the GlobalDrawer

REPOSITORY
  R169 Kirigami

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16375

AFFECTED FILES
  src/controls/GlobalDrawer.qml
  src/controls/private/BannerImage.qml

To: apol, #kirigami, mart
Cc: plasma-devel, dkardarakos, apol, davidedmundson, mart, hein
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