D26630: Fix warning

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  columnview.cpp:7: TypeError: Cannot read property 'contentX' of null

TEST PLAN
  Used to get it all the time in Discover

REPOSITORY
  R169 Kirigami

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26630

AFFECTED FILES
  src/columnview.cpp

To: apol, #kirigami
Cc: plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, davidedmundson, mart, hein
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