Add empty transport message stub for failed messages

:Release Notes:
Added empty transport message stub singleton in failed messages

:Detailed Notes:

:Testing Performed:
All unit tests passed

:QA Notes:

:Issues Addressed:
[GF-38362] luna-service2: Add empty transport message stub for failed
           messages

Open-webOS-DCO-1.0-Signed-off-by: Mykola Kryvonos <mykola.kryvonos@lge.com>

Change-Id: I781b82525762c976d4761896a263d77ac3113124
Reviewed-on: https://g2g.palm.com/3437
Reviewed-by: Build Verification
Reviewed-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Tested-by: Mykola Kryvonos <mykola.kryvonos@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>