Adjust 'devices' list check for being not defined in purge-cluster playbook (see PR #1024)
Adjust 'devices' list check for being not defined in purge-cluster playbook (see PR #1024)

Signed-off-by: Eduard Egorov <efdf1f33329f7433e918afa19eff4187f30352cd@icl-services.com>

WingkaiHo/ceph-ansible,jsaintrocc/ceph-ansible,travmi/ceph-ansible,bengland2/ceph-ansible,guits/ceph-ansible,albertomurillo/ceph-ansible,font/ceph-ansible,WingkaiHo/ceph-ansible,travmi/ceph-ansible,jsaintrocc/ceph-ansible,jtaleric/ceph-ansible,jtaleric/ceph-ansible,WingkaiHo/ceph-ansible,fgal/ceph-ansible,bengland2/ceph-ansible,font/ceph-ansible,guits/ceph-ansible,albertomurillo/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,albertomurillo/ceph-ansible,ceph/ceph-ansible