D18481: [applets/appmenu] Show placeholder when configuring and empty

[David Edmundson]

davidedmundson added a comment.


  F6564166: Screenshot_20190123_190537.png <https://phabricator.kde.org/F6564166>

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D18481

To: davidedmundson, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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