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We don't return an error on 0 updates now, so we need the length check.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1039714

This is the same as the g-s-d fix in gnome-3-10.

Resolves: https://bugzilla.gnome.org/show_bug.cgi?id=719869

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=719957

If the user switches away back to the overview before the screenshot has
finished downloading, we can crash the service in some circumstances.

- with banners
- would be nice to be able to control text-shadow form the ini.

It's XML afterall...

Thanks to the new Continuous warning highlighting!

http://build.gnome.org/continuous/buildmaster/builds/2013/11/24/31/build/warnings-gnome-software.txt

It was using translatable="True" instead of translatable="yes"
in a few places. Perils of handwritten .ui files...

https://bugzilla.gnome.org/show_bug.cgi?id=715109

This can really only happen if we're using 'gnome-software --mode=updated'
without a valid offline update, but it's misleading and confusing to show a
'No updates available' message in this case.