Fix ls-monitor -c not catch call w/o service name

:Release Notes:
Fix ls-monitor compact mode which does not catch method call/signal
/cancel without service name. Call without service name is generated
by luna-send.

:Detailed Notes:
Original ls-monitor print "(null)" implicitly if service name is null.
In compact mode service name must not null to make compact name.
This patch supply "(null)" explicitly if service name is null.

:Testing Performed:
ls-monitor -c print save number of log when luna-send is used.
Tested on g2 phone.

luna-send -n 1 -f palm://com.lge.service.music/getAudioFiles
'{"select":["_id"]}'

:QA Notes:

:Issues Addressed:
[ANG-5035] ls-monitor compact mode does not catch method call from
           luna-send

Open-webOS-DCO-1.0-Signed-off-by: SangWook Han <sangwook.han@lge.com>

Change-Id: I6bb948a4e4df876a7fac6ad8da1d766eb4b2caba
Reviewed-on: https://g2g.palm.com/5159
Reviewed-by: DCO Verification
Reviewed-by: SangWook Han <sangwook.han@lge.com>
Tested-by: SangWook Han <sangwook.han@lge.com>
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Alexandr Smoktal <alexandr.smoktal@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>