Don't generate appstream data for files that lack a description
Summary:
They end up being broken appstream files and it fails on the users' faces.
Have it as a warning to the developers instead.
BUG: 400431
Reviewers: Plasma, Frameworks, ngraham
Reviewed By: ngraham
Subscribers: ngraham, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D16867