D13864: [Splash Screen KCM] Fix "no thumbnail" icon for "None"

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, mart.
Restricted Application added a project: Plasma.
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REVISION SUMMARY
  In JavaScript `undefined` does not convert to empty string, so `undefined != ""` is always `true`.
  The role isn't added to the `QStandardItemModel` for "None", so it is `undefined` (null `QVariant`) as far as QML is concerned.

TEST PLAN
  5.13
  "None" has the "no thumbnail available" icon now

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D13864

AFFECTED FILES
  kcms/ksplash/package/contents/ui/main.qml

To: broulik, #plasma, mart
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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