registration-relation broke, wrong arguments for config_changed()

[Andreas Hasenack]

This relation is only exposed by a private charm so far, so the bug does not affect the general public yet.

2013-11-28 19:46:37 INFO juju.worker.uniter uniter.go:348 running "registration-relation-changed" hook
2013-11-28 19:46:37 INFO worker.uniter.jujuc server.go:108 running hook tool "relation-get" ["--format" "json"]
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK Traceback (most recent call last):
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-landscape-client-0/charm/hooks/registration-relation-changed", line 170, in <module>
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK sys.exit(hook(JujuBroker(), LandscapeBroker()))
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-landscape-client-0/charm/hooks/registration-relation-changed", line 30, in registration_relation
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK config_changed(relation_data=data)
2013-11-28 19:46:37 INFO juju.worker.uniter context.go:255 HOOK TypeError: config_changed() takes at least 2 arguments (1 given)
2013-11-28 19:46:38 ERROR juju.worker.uniter uniter.go:350 hook failed: exit status 1
2013-11-28 19:46:38 INFO juju.worker.uniter modes.go:421 ModeHookError starting