wizard-downloads: Check for OSes without medias
This is a very corner case, but it might happen that the user does not have data in the osinfo-db at all, causing us to populate the recommended list model with a null pointer.
Fixes #283 (closed)
This is a very corner case, but it might happen that the user does not have data in the osinfo-db at all, causing us to populate the recommended list model with a null pointer.
Fixes #283 (closed)