While commit 0af8ce9e makes it so new copied
journals etc shouldn't get lost, there are accounts that had copied journals
from before commit 5e07db54 went into effect,
and are now hence hidden. This new commit works around that so that the option
to enable multiblogs is visible if it is somehow disabled for someone with
multiple journals, rather than just being ignored for everyone with multiple
journals. A discreet notice has been placed on /artefact/blog/view/ so that
the user knows.

Change-Id: I6d65aa934d3f3368083e55b21a30fb00d5a0c132