[Merge] lp:~seb128/update-manager/use-correct-variable into lp:update-manager

[Sebastien Bacher]

That should fix the traceback on bug #1142151 (which is the most reported issue on raring today).

I'm still unsure why it hits this error path though, it seems it would happen in the case where
- there is no content in the package (otherwise "installed_file" would be set), so dummy transitional package? 
- there is a match for /usr/share/app-install/desktop/$pkg:* (otherwise it wouldn't try to load a .desktop)
- the import of that file fails (that seems quite frequent, especially than glib got pickier on loading files with errors)

Looking at the upgrade log on the bug attached, some of the gnome-games got upgraded in that run, so maybe one of those leads to that case?
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https://code.launchpad.net/~seb128/update-manager/use-correct-variable/+merge/159204
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