Let kicker display executable items instead of empty buttons.
Summary:
This would partially fix https://bugs.kde.org/show_bug.cgi?id=369242
Another patch is required not to show empty elements (in case data() returns QVariant()).
Reviewers: hein, Plasma, davidedmundson, mart
Reviewed By: Plasma, davidedmundson, mart
Subscribers: mart, broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D2846