applets/kicker: return empty string for computermodel description

Christoph Wolkrequested to merge
cwo/plasma-workspace:kicker_computermodel_description into master

Reason for the change

ComputerModel only has a description for some places entries, not all of them. We return invalid QVariant if there isn't any, which used to work but is now "undefined" on required properties in Qt 6.11.

Instead, return empty string.

Test plan

Open kickoff, switch to Places tab.

Screenshots or screen recordings

See bug report.

Bugs fixed

BUG: 521799 FIXED-IN: 6.6.6

Merge request reports