D14443: Use nullptr

[Alex]

al1xz added a reviewer: Dolphin.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D14443

To: al1xz, #dolphin
Cc: kfm-devel, spoorun, navarromorales, firef, andrebarros, emmanuelp
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