Bug 21426: Handle USE_MEMCACHED=no in koha-create

Bug 21426: Handle USE_MEMCACHED=no in koha-create

Signed-off-by: Andreas Roussos <arouss1980@gmail.com>
Works as intended. I've set USE_MEMCACHED to "no" and created a new
Koha instance. Home > About now reports this information: Memcached:
Servers: undefined | Namespace: undefined | Status: unknown | Config
read from: Nowhere [...] | Effective caching method: Cache::Memory

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit ffca9decadf539018e447237e56bce76c81bdd64)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>