D5942: Check if plymouth file is known to update-alternatives before setting

[Marco Martin]

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

REPOSITORY
  R258 Plymouth KCM

REVISION DETAIL
  https://phabricator.kde.org/D5942

To: leszeklesner, mart
Cc: plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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