Description of problem:
Empty path segments (file-handler in this case) are ignored while parsing the command. This could lead to some unexpected behaviour.
[standalone@localhost:9999 /] echo-dmr /subsystem=logging/file-handler=:remove
{
    "address" => [("subsystem" => "logging")],
    "operation" => "remove"
}

Version-Release number of selected component (if applicable):
 6.4.0.DR11

How reproducible:
 Always

Steps to Reproduce:
I can imagine a case where $PROP variable is not/wrongly set and user accidentally remove security subsystem from full profile configuration.
 1. start domain and connect to CLI
 2. ./jboss-cli.sh -c "/profile=full/subsystem=security/security-domain=$PROP:remove"

Actual results:
 Security subsystem is removed from full profile configuration

Expected results:
 Operation fails