D9215: Make Appmenu work based on the presence of a visual representation

[Marco Martin]

mart added a dependent revision: D9267: remove menubar settings.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9215

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