Returns the scores associated with the specified
members in the sorted set stored at
member that does not exist in the sorted set, a
nil value is returned.
Array reply: list of scores or
nil associated with the specified
member values (a double precision floating point number),
represented as strings.
(integer) 1redis> ZADD myzset 2 "two"
(integer) 1redis> ZMSCORE myzset "one" "two" "nofield"
ERR Unknown or disabled command 'ZMSCORE'