Comment 12 for bug 1553156

Okay, looks like nobody does the archive-wide data-hunt, and all fix their packaging or didn't have that problem (asked Arch, Fedora, got fuzzy reply from OpenSUSE because I couldn't find someone directly involved with this stuff).

So I would right now rather like to add an error hint warning about missing binaries / metainfo / .desktop files, instead of making the metadata extractor more complex to accomodate for few packages shipping .desktop file and metainfo in a package separated from the project's main binary.