(fixes #2516) fixed factories.yml for pc_backend not to cause warning
(fixes #2516) fixed factories.yml for pc_backend not to cause warning

openpne/OpenPNE3,tejima/OP3PKG,nise-nabe/ppcon-sns,openpne/OpenPNE3,openpne/OpenPNE3,tejima/OP3PKG,openpne/OpenPNE3,nise-nabe/ppcon-sns