list ltm virtual does not show anything

You would start by changing to the partition you want to use. So on my box I have a partition named shoji:

root@(v13b)(cfg-sync Changes Pending)(Standby)(/Common)(tmos) cd /shoji
root@(v13b)(cfg-sync Changes Pending)(Standby)(/shoji)(tmos) list /ltm virtual 
ltm virtual Emperor_VS {
    destination 10.10.2.109:http
    ip-protocol tcp
    mask 255.255.255.255
    partition shoji
    policies {
        asm_auto_l7_policy__Emperor_VS { }
    }
    pool Shogun_pool
    profiles {
        /Common/http { }
        /Common/tcp { }
        /Common/websecurity { }
        ASM_Tokugawa { }
    }
    source 0.0.0.0/0
    translate-address enabled
    translate-port enabled
    vs-index 10
}

And in this case I only have the one virtual server, listed here.