D8473: Modernize code. Use nullptr where it's possible

[Eike Hein]

hein accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  modernize_folderplugin

REVISION DETAIL
  https://phabricator.kde.org/D8473

To: mlaurent, hein
Cc: broulik, ngraham, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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