[Merge] ~jawn-smith/software-properties:outdated_cache_error_dialog into software-properties:ubuntu/master

[William Wilson]

The proposal to merge ~jawn-smith/software-properties:outdated_cache_error_dialog into software-properties:ubuntu/master has been updated.

Commit message changed to:

Changing the variable passed to the Error dialog to the correct variable type"

For more details, see:
https://code.launchpad.net/~jawn-smith/software-properties/+git/software-properties/+merge/396874
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