Description of problem:

When using "if"  construct in CLI, we are unable to check result undefined


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

EAP 6.1, EAP 6.2

How reproducible:

Configure an EAP instance with an undefined propertie (e.g.: ssl protocol

...

 <connector name="https" protocol="HTTP/1.1" scheme="https" socket-binding="https" enable-lookups="false" secure="true">
                <ssl name="https" key-alias="ALIAS" password="password" certificate-key-file="${jboss.server.config.dir}/keystore.jks" />
            </connector>
....

Check that a read-attribute return undefined:

/subsystem=web/connector=https/ssl=configuration/:read-attribute(name=protocol)
{
    "outcome" => "success",
    "result" => undefined
}


Define an if construct checking for undefined:

 [standalone@localhost:9999 /] if (result == undefined) of /subsystem=web/connector=https/ssl=configuration/:read-attribute(name=protocol)
[standalone@localhost:9999 / #] /subsystem=web/connector=https/ssl=configuration/:write-attribute(name=protocol,value="TLSv1,TLSv1.1")
#1 /subsystem=web/connector=https/ssl=configuration:write-attribute(name=protocol,value="TLSv1,TLSv1.1")
[standalone@localhost:9999 / #] end-if

Verify that the attribute is not changed:


/subsystem=web/connector=https/ssl=configuration/:read-attribute(name=protocol)
{
    "outcome" => "success",
    "result" => undefined
}



Steps to Reproduce:
1.
2.
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Actual results:

If condition not evaluated correctly

Expected results:

If condition works correctly with undefined

Additional info: