D28765: KSettings::Dialog: add support for KPluginInfos without a KService

[David Faure]

dfaure added a reviewer: ngraham.

REPOSITORY
  R295 KCMUtils

REVISION DETAIL
  https://phabricator.kde.org/D28765

To: dfaure, pino, broulik, mart, davidedmundson, ngraham
Cc: cblack, kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns