Fix bug (check null didn't work)

Summary: Found a bug when adding this component to system settings, != null didn't work

Test Plan: Tested with applications already using this component with a shortcut (discover, okular mobile discover) no regression. And work with my local build of system settings

Reviewers: Kirigami, mart, apol

Reviewed By: Kirigami, mart

Subscribers: plasma-devel

Tags: Kirigami

Differential Revision: https://phabricator.kde.org/D19314