kcm: Handle recommended drivers not found scenario

Mike Noerequested to merge
work/noee/cpfix2 into Plasma/6.0

For discovered devices, we query open systems printing for recommended drivers. It could be that there are no recommended drivers found or the service is not installed, so give the ability to select the driver manually as a fallback.

BUG: 482409 (cherry picked from commit ab7c5e31)

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