D5916: Fix warnings

[Aleix Pol Gonzalez]

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

REVISION SUMMARY
  Makes sure we are not calling null objects.

REPOSITORY
  R169 Kirigami

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5916

AFFECTED FILES
  src/controls/PageRow.qml

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