[Merge] lp:~seb128/software-properties/handle-no-candidate into lp:software-properties

[Sebastien Bacher]

Not sure what it means having no candidate version, but that's happening, see that error bucket
https://errors.ubuntu.com/problem/55c1babf9ec1556365267f9ae7de740aec64d777

"  File "/usr/lib/python3/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 1260, in gather_device_data
    description = _("Using {} from {}").format(pkg.candidate.summary, pkg.shortname)
AttributeError: 'NoneType' object has no attribute 'summary'"

(I tried to install an nvidia driver and remove the apt source containing it but that's not enough to reproduce the issue)

Note that you can test software-propoerties on hardware that don't require binary drivers using
"usr/share/ubuntu-drivers-common/fake-devices-wrapper software-properties-gtk"
-- 
https://code.launchpad.net/~seb128/software-properties/handle-no-candidate/+merge/197917
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~seb128/software-properties/handle-no-candidate into lp:software-properties.