Storage wrappers should normally always be registered inside a presetup
hook. However in the public link scenario this is not possible and
there is currently no good alternative with the current architecture.
Instead of logging a warning every time, this fix prevents the warning
to be shown but also adds a FIXME in the code for the future. This is
ok because this app is already using private/internal APIs at the
moment and should be reworked properly in the future.
This is needed because in some cases like LDAP, the user manager itself
might trigger avatar updates which would internally also call
initMountPoints with the same user. This could cause the same user to
be setup twice, and in some sharing situations could cause recursive
deduplication of shares by adding "(2)" every time.
This makes sure that even if a NFD file name exists, it is found by the
storage and will be visible to higher layers. Even though the file will
be discarded anyway there, it gives the scanner a chance to display a
warning at least.
