[Merge] ~osomon/software-properties:updates-refresh into software-properties:ubuntu/master

[Didier Roche]

Maybe check with mpt, but I think disabling the widget when it’s in "Custom" and we can’t fix it is a good stop gap solution.

The second side is the wrong detection of broken config (some components disabled in the release pockets, but not on others), do you think you can detect it and display "Custom" for them as well?
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https://code.launchpad.net/~osomon/software-properties/+git/software-properties/+merge/379345
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