Do not pass unknown_error atom to plugin
Do not pass unknown_error atom to plugin

There is no reason to pass {unknown_error, Error} to plugin and force it to
implement a match on that tuple. We should pass the Error itself and let
the plugin decide what to do with it.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb