Hide error if a background request fails during navigation

If you open the dashboard but quickly navigate somewhere else, a toast
will show telling you that the weather status could not be fetched. As a
user I don't care about this. This is only relevant if the user intents
to no leave the page.

So let's not show a toast for aborted connections. This makes the UX a
tad smoother.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>