Memcached connection never adds server controllers
Memcached connection never adds server controllers

When connecting to Memcached, the code checks for existing connections
and uses that if present.

Problem is that getServerList() returns an empty array when there are
none, so the is_array() test is always true and connect() returned true
without ever adding the configured server controllers.

Fixes #807

ipso/ADOdb,ipso/ADOdb