Errors when deleting Habitat resource

[asymmetric]

When deleting a Habitat, the following errors are displayed:

ts=2017-11-08T12:02:17.98051371+01:00 level=info component=controller msg="deleted deployment" name=example-leader-follower-habitat
ts=2017-11-08T12:02:17.983844937+01:00 level=error component=controller msg="deployments.apps \"example-leader-follower-habitat\" not found"
ts=2017-11-08T12:02:17.98428139+01:00 level=error component=controller msg="Habitat could not be synced, requeueing" msg="deployments.apps \"example-leader-follower-habitat\"
 not found"

The actual Habitat is removed.

This seems like it could have been introduced in #113.