Correctly check for key max len

Ignore bad stories instead of breaking the whole feed.
Revert "Better debug output, I think"

This reverts commit 2423970612e73fd014306f5f6932fa631e447284.
Better handling of not viewed feeds in push

On subscribe, error on a not viewed feed so pubsub stops giving us updates.
On update, silently accept, but discard, so it thinks everything is fine
and we save resources.